I would like to understand if it is possible to open two documents at the same time and display them side by side (say, the first document on the left and the second document on the right of the screen). This issue is discussed in this older post How can I see two tex-files in TeXstudio simultaneously? but unfortunately the answer is not clear. It says to click on the appropriate file tabs but doesn't say where! I'm looking for a very simple explanation: click here and here, nothing fancy. Thanks!
It is possible to split the editor window into horizontal or vertical panes by opening two files then clicking on the tabs
NOTE I have not been able to have two views of one file unless you save the first to a different name and reopen as per the example that you link to.
With a single file it is meaningless but with two files you get more options
when you right-click on each tab.
It is confusing that
Split Horizontally and
Vertically seem to be the opposite of intended like it is a STATUS indicator and toggle AFTER you move one file to the other view
Hope that's simple enough and try the other options,such as Set Read-Only on one file so you cant accidentally edit the wrong one.
https://tex.stackexchange.com/a/473233/170109 (dual sessions/instances)
https://tex.stackexchange.com/a/471069/170109 (split viewers) and https://tex.stackexchange.com/a/472806/170109 (split editor and viewers)