In fullscreen, the bottom line of text gets cut off.

Fullscreen (bugged): https://imgur.com/a/HVQta22
Windowed (normal): https://imgur.com/a/A9UG5zi

Some more examples:
1.
Fullscreen: https://imgur.com/a/rs1Em73
Windowed: https://imgur.com/a/RKpHFCH
2.
Fullscreen: https://imgur.com/a/xhcfxfB
Windowed: https://imgur.com/a/MEHrB34

Also, I would like to see the user options menu when in fullscreen (see images below)
This is what I see when clicking a name at the bottom of the chat (FULLSCREEN) https://imgur.com/a/TfcAcfy
This is what I see when clicking a name at the bottom of the chat (WINDOWED) https://imgur.com/a/GpWsauJ

I tried the same thing as you but, that happened to me.
It's likely intentional if people happens to be on the fullscreen IF that's your case
according to me, i don't really use that fullscreen feature and, this is one of the reasons why i am NOT getting used to that.

Sorry for the bad grammar. it's not like everyone's first language is English