# Rotated page starts at the edge of the paper

I'm rotating a page because of a wide figure, but it then begins just at the edge of the page, with no margins. I'm puzzled as I expected the rotated page to inherit the margins of the document it is inserted in. Further, I'd like it to be centered in the page.

\documentclass{amsbook}
\usepackage{graphicx}
\usepackage{subcaption}
\usepackage[figuresright]{rotating}

\begin{document}

\begin{sidewaysfigure}
\subcaptionbox{Returns $\alpha = 1$}{\includegraphics[width=.33\linewidth]{Rendimientos1}}%
\subcaptionbox{Returns $\alpha = \frac{1}{2}$}{\includegraphics[width=.33\linewidth]{Rendimientos1-2}}%
\subcaptionbox{Returns $\alpha = 2$}{\includegraphics[width=.33\linewidth]{Rendimientos2}}%
\caption{Returns}
\end{sidewaysfigure}

\end{document}


Also, my subfigures are too close together. I've tried changing the width of the \subcaptionbox as

  \subcaptionbox{Returns $\alpha = 1$}[.3\linewidth]{\includegraphics[width=.33\linewidth]{Rendimientos1}}%


but this seems to affect the size of the figure, rather than that of the box.

Finally, I get subfigures labelled (A), (B), ... and I'd rather have (a), (b). I'm guessing this has to do with the default option labelformat=parens, but I'm unsure how to modify it. I've tried

\renewcommand{\thesubfigure}{\alph{subfigure}}


but it doesn't seem to work.

Edit: I've managed to get more space between the figures and include a margin. In the process, I've rewritten my code to something easier (for me) to understand. However, the solution is quite ad hoc and doesn't seem too elegant. In addition, the output still uses uppercase letters to identify the subfigures.

\documentclass{amsbook}
\usepackage{amssymb}
\usepackage{amsfonts}

\usepackage{graphicx}
\usepackage{subcaption}
\usepackage[figuresright]{rotating}

\begin{document}

\begin{sidewaysfigure}
\vspace{13cm}
\begin{subfigure}[b]{.33\linewidth}
\centering
\includegraphics[width=.9\linewidth]{Rendimientos12}%
\caption{$\alpha=\frac{1}{2}$}
\end{subfigure}%
\begin{subfigure}[b]{.33\linewidth}
\centering
\includegraphics[width=.9\linewidth]{Rendimientos1}%
\caption{$\alpha=1$}
\end{subfigure}
\begin{subfigure}[b]{.33\linewidth}
\centering
\includegraphics[width=.9\linewidth]{Rendimientos2}%
\caption{$\alpha=2$}
\end{subfigure}
\caption{General caption}
\end{sidewaysfigure}

\end{document}


My questions:

1. Is there a more elegant alternative to the use of \vspace?
2. How do I change the format of the subcaption to lowercase? I've tried alternatives proposed here or here to no avail. I'm guessing it may have to do with the document class.
• Welcome to TeX.SX! Jul 31, 2020 at 10:02
• @Davislor, thanks. I'm looking forward to learning a lot! Jul 31, 2020 at 10:25

For point 1, see here: https://tex.stackexchange.com/a/239570/101651.

For point 2, you guessed right, the amsbook class forces the caption labels to be in small caps.

With

\usepackage{xpatch}
\makeatletter
\makeatother


you can avoid it. Then with

\usepackage{subcaption}
\captionsetup{labelfont=sc}
\captionsetup[subfigure]{labelfont=normal}


you can set all caption labels as small caps but subfigure labels as normal font.

I think these corrections don't affect other settings of the documentclass, but pay attention.

% see here: https://tex.stackexchange.com/a/239570/101651
\RequirePackage{rotating}
\documentclass{amsbook}
\usepackage{xpatch}
\makeatletter
\makeatother

\usepackage{amssymb}
\usepackage{amsfonts}

\usepackage{graphicx}
\usepackage{subcaption}
\captionsetup{labelfont=sc}
\captionsetup[subfigure]{labelfont=normal}

\begin{document}
\begin{sidewaysfigure}\centering
\begin{subfigure}[b]{.33\linewidth}
\centering
\includegraphics[width=.9\linewidth]{example-image-a}%
\caption{$\alpha=\frac{1}{2}$}
\end{subfigure}%
\begin{subfigure}[b]{.33\linewidth}
\centering
\includegraphics[width=.9\linewidth]{example-image-b}%
\caption{$\alpha=1$}
\end{subfigure}
\begin{subfigure}[b]{.33\linewidth}
\centering
\includegraphics[width=.9\linewidth]{example-image-c}%
\caption{$\alpha=2$}
\end{subfigure}
\caption{General caption}
\end{sidewaysfigure}
\end{document}