[2020] Camera issues (ANSWERED)

Add the launch options -noWorkshop and -disableMods (make sure they're spelled exactly like that or they won't do anything) to Steam and start a new city on one of the default maps. Does it work? If yes, then it's a problem with a mod you have installed. If no, then try resetting keybinds for the game as well as try the key options to rotate (in case the mouse is dying).