F11 no longer exits composition/full screen mode after the latest update (I’d have to use Esc key instead).
It does on my install.
Does your machine have a FN key that toggles F keys and action keys?.
Nope. F11 still can get me into composition/full-screen mode, but can’t get me out of it anymore. Only Esc key can get me out.
For another data point, F11 still toggles correctly for me in Beta 25.
I’ve got this set to F10, and it works both ways, enter composition mode and exit composition mode.