Could you please explain a little more on what X11 and wayland are?
Not the one you asked*.
But, to put it simply, there's a piece/suite of software that's actually responsible for displaying stuff. Even your Desktop Environment is contingent upon it. X11 and Wayland are the two most popular 'options' for that and (to be frank) the ones that are 'actually' in use. The former is the OG and was for the longest time pretty much your only option. But the latter has come a long way and is a superior option for most.
In the context of Cinnamon, its Wayland implementation is still relatively immature. Heck, only with its next release will it become non-experimental. But, even then, it is possible that switching will make a difference here.
How can I find out the information you are looking for?
Invoke echo $XDG_SESSION_TYPE within a terminal. It will return whichever you're on.