I have installed and used android version 13.0 for this problem.
When I open an email or select it via message list I can choose “move to” folder via 3 dot menu and get a list of my imap folders, but when a folder is at the end of the list (in my case the trash folder, but it could also be another folder) then this folder is “behind” the navigationbuttons of android. And I can’t hide this android system buttons. I blurred my private details for the screenshot.
In your case Sent Foldet is behind the Navigation Buttons, it doesn’t seem to be the last folder? Or you have less folders (I have made the screenshot while scrolling to show the scrollbar because I have more than 20 folders)?