On iPadOS 26 and 27 the window controls cover up the back button

Yeah, you can toggle a setting now that enables windowing and a menubar (the menubar is hidden by default tho you can toggle to have it always on). It’s reminiscent of macOS, but not as flexible. It can be janky sometimes.

Added windowing as an option.

True, but the placement of the window controls can be adjusted apparently. Ivory (mastodon client) on iPad has the controls placed closer to the top of its window so it doesn’t block any toolbar buttons.