I have a 144 Hz monitor, in game Minecraft runs at higher than 144 fps and is smooth, but in the main menu, create world, options etc. (everything that is when I'm not in a world) is capped at 60 fps. Updating NVidia drivers did not help. In Minecraft 1.12.2 menu doesn't have this problem.
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Can confirm on 1.20.1
When looking at the code it seems that it is indeed locked at 60 fps when those criteria are met.
The fix is just a simple one-liner actually.
Here is the code which is probably the cause:
(Note that this code has been decompiled, so the variable names may not match the original source)
[media]
Did not realize this was a newer code change compared to previous versions.
Have you tried changing the settings inside of NVidia's panel?