@leocg I do not know which page it was. I looked through history but couldn't decide. But here is what I found (and most likely cause).
Opera version 75.0.3969.149
- Go to twitter.com (logged in)
- F11 to go to full screen.
- ESC does not work.
- Right context menu does show Exit Full screen as an option, but not everywhere.
if I can reproduce it (find the page where exit menu entry was not available) I will update.