…looked for this in existing reports, didn’t find any that quite matched. If this is a duplicate, many apologies.
If I am in full-screen mode, alt-tab to a different window, and then alt-tab back, Scrivener is still in full-screen mode but the cursor is not there, and shift-arrow to highlight text does not show up. The focus is still in the editor, so typing will show up, but it’s focused on the main editor, not the full-screen version: if I have it set up so that I can see the normal Scrivener window while in full screen mode, I can see the cursor blinking, and can see the blue text of highlighting, all in the background window.
(…in making sure this was reliably reproducible, I managed to get Scrivener into a state where typing in the full-screen editor doesn’t work. I can F11 out to type in the normal editor, but if I F11 back to FS it doesn’t seem to respond. )
This problem (well, both problems) can be resolved by clicking in the full-screen editor window, so it’s somewhat trivial, but I like my programs, especially writing programs, to behave when used with just the keyboard. (I have mobility restrictions that make using the mouse hard.)