Is there a way to enable fullscreen to allow for me to use a separate monitor for wiki and stuff? Everytime I click outside of my game or ALT+TAB, or anything pops up, the game will completely crash.
There are 3 options in the launcher via windowed Mode
If you select Virtual Fullscreen you will have Alt-Tabbing allowed.
Fullscreen does not (It's the classic version).
Also if you want to use it on another monitor screen (not your automatic main screen) you can use windowed and move the screen and use Borderless gaming to make it fullscreen & alt-tabbable.