How do I rotate labels in a tree diagram drawn with forest?

Question

I am in the process of drawing a huge tree diagram that I want to fit on a single page (at the moment it does not fit on an A1 page). A simple way to do this would be to rotate the labels. I know this question has already been answered here: Rotate text in TikZ, but I still can't figure out how to do it!

Here is my code:

\documentclass[12pt]{article}
\usepackage{forest}
\usepackage{lscape}
\usepackage[a1paper, margin=1mm]{geometry}






\begin{document}

\begin{landscape}
\begin{forest}  
[Omissive Bridging Principles
                         [Attitudinal
                                     [Beliefs
                                             [Wide
                                                  [Ought
                                                        [Positive]
                                                        [Negative]]
                                                  [Reason to
                                                             [Positive]
                                                             [Negative]]
                                                  [Permitted to
                                                               [Positive]
                                                               [Negative]]]
                                             [Narrow
                                                    [Ought
                                                          [Positive]
                                                          [Negative]]
                                                    [Reason to
                                                              [Positive]
                                                              [Negative]]
                                                    [Permitted to
                                                                 [Positive]
                                                                 [Negative]]]
                                             [Doubly Embedded
                                                             [Ought
                                                                   [Positive]
                                                                   [Negative]]
                                                             [Reason to
                                                                   [Positive]
                                                                   [Negative]]
                                                             [Permitted to
                                                                   [Positive]
                                                                   [Negative]]]]
                                     [Credences
                                               [Wide
                                                    [Ought
                                                          [Positive]
                                                          [Negative]]
                                                    [Reason to
                                                              [Positive]
                                                              [Negative]]
                                                    [Permitted to
                                                                 [Positive]
                                                                 [Negative]]]
                                               [Narrow
                                                      [Ought
                                                            [Positive]
                                                            [Negative]]
                                                      [Reason to
                                                                [Positive]
                                                                [Negative]]
                                                      [Permitted to
                                                                   [Positive]
                                                                   [Negative]]]
                                               [Doubly Embedded
                                                               [Ought
                                                                     [Positive]
                                                                     [Negative]]
                                                               [Reason to
                                                                         [Positive]
                                                                         [Negative]]
                                                               [Permitted to
                                                                            [Positive]
                                                                            [Negative]]]]]
                         [Attitudinal
                         [Beliefs
                         [Wide
                         [Ought
                         [Positive]
                         [Negative]]
                         [Reason to
                         [Positive]
                         [Negative]]
                         [Permitted to
                         [Positive]
                         [Negative]]]
                         [Narrow
                         [Ought
                         [Positive]
                         [Negative]]
                         [Reason to
                         [Positive]
                         [Negative]]
                         [Permitted to
                         [Positive]
                         [Negative]]]
                         [Doubly Embedded
                         [Ought
                         [Positive]
                         [Negative]]
                         [Reason to
                         [Positive]
                         [Negative]]
                         [Permitted to
                         [Positive]
                         [Negative]]]]
                         [Credences
                         [Wide
                         [Ought
                         [Positive]
                         [Negative]]
                         [Reason to
                         [Positive]
                         [Negative]]
                         [Permitted to
                         [Positive]
                         [Negative]]]
                         [Narrow
                         [Ought
                         [Positive]
                         [Negative]]
                         [Reason to
                         [Positive]
                         [Negative]]
                         [Permitted to
                         [Positive]
                         [Negative]]]
                         [Doubly Embedded
                         [Ought
                         [Positive]
                         [Negative]]
                         [Reason to
                         [Positive]
                         [Negative]]
                         [Permitted to
                         [Positive]
                         [Negative]]]]]]                                                       
\end{forest}
\end{landscape}








\end{document}

Sorry about the second half of the code, it's identical to the first half but badly laid out. I want to rotate pretty much all the labels so they are horizontal (at the moment they are vertical because the page is landscape).

Thanks so much for your help!

Answer 1

Just add for tree={rotate=-90}.

\documentclass[12pt]{article}
\usepackage{forest}
\usepackage{lscape}
\usepackage[a1paper, margin=1mm]{geometry}
\begin{document}
\begin{landscape}
\begin{forest}  
for tree={rotate=-90}
[Omissive Bridging Principles
                         [Attitudinal
                                     [Beliefs
                                             [Wide
                                                  [Ought
                                                        [Positive]
                                                        [Negative]]
                                                  [Reason to
                                                             [Positive]
                                                             [Negative]]
                                                  [Permitted to
                                                               [Positive]
                                                               [Negative]]]
                                             [Narrow
                                                    [Ought
                                                          [Positive]
                                                          [Negative]]
                                                    [Reason to
                                                              [Positive]
                                                              [Negative]]
                                                    [Permitted to
                                                                 [Positive]
                                                                 [Negative]]]
                                             [Doubly Embedded
                                                             [Ought
                                                                   [Positive]
                                                                   [Negative]]
                                                             [Reason to
                                                                   [Positive]
                                                                   [Negative]]
                                                             [Permitted to
                                                                   [Positive]
                                                                   [Negative]]]]
                                     [Credences
                                               [Wide
                                                    [Ought
                                                          [Positive]
                                                          [Negative]]
                                                    [Reason to
                                                              [Positive]
                                                              [Negative]]
                                                    [Permitted to
                                                                 [Positive]
                                                                 [Negative]]]
                                               [Narrow
                                                      [Ought
                                                            [Positive]
                                                            [Negative]]
                                                      [Reason to
                                                                [Positive]
                                                                [Negative]]
                                                      [Permitted to
                                                                   [Positive]
                                                                   [Negative]]]
                                               [Doubly Embedded
                                                               [Ought
                                                                     [Positive]
                                                                     [Negative]]
                                                               [Reason to
                                                                         [Positive]
                                                                         [Negative]]
                                                               [Permitted to
                                                                            [Positive]
                                                                            [Negative]]]]]
                         [Attitudinal
                         [Beliefs
                         [Wide
                         [Ought
                         [Positive]
                         [Negative]]
                         [Reason to
                         [Positive]
                         [Negative]]
                         [Permitted to
                         [Positive]
                         [Negative]]]
                         [Narrow
                         [Ought
                         [Positive]
                         [Negative]]
                         [Reason to
                         [Positive]
                         [Negative]]
                         [Permitted to
                         [Positive]
                         [Negative]]]
                         [Doubly Embedded
                         [Ought
                         [Positive]
                         [Negative]]
                         [Reason to
                         [Positive]
                         [Negative]]
                         [Permitted to
                         [Positive]
                         [Negative]]]]
                         [Credences
                         [Wide
                         [Ought
                         [Positive]
                         [Negative]]
                         [Reason to
                         [Positive]
                         [Negative]]
                         [Permitted to
                         [Positive]
                         [Negative]]]
                         [Narrow
                         [Ought
                         [Positive]
                         [Negative]]
                         [Reason to
                         [Positive]
                         [Negative]]
                         [Permitted to
                         [Positive]
                         [Negative]]]
                         [Doubly Embedded
                         [Ought
                         [Positive]
                         [Negative]]
                         [Reason to
                         [Positive]
                         [Negative]]
                         [Permitted to
                         [Positive]
                         [Negative]]]]]]                                                       
\end{forest}
\end{landscape}
\end{document}

You could also change the grow direction and not use landscape.