The F3 Debug Menu can be toggled using F3 in any menu in the game, not just in an open world. I originally discovered this by exiting a world with the menu open, and the menu persisted on screen into the main menu screen. I tested minor revision releases until the menu did not appear when pressing F3 on the main menu screen, and found that this behavior existed in 1.21.9, and not in 1.21.8. I also tested 1.21.11-pre2 and this occurs in that version as well.
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Hi!
Thank you for your report!
However this works as intendent.
We're already resolved this issue at MC-300118, so I will resolve and link this ticket as a Duplicate.
I suggest also to browse through the main issue for potential fixes.
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Worse yet, you can activate IN the main menu.