Game Window won't go Full Screen

Hi! I haven't had to do this before but I cannot seem to figure out what's wrong on my own. 

Basically when I went to open my game last night the game screen wouldn't open to full screen (the top bar of my desktop was showing as well as the dock at the bottom). I always play full screen on my laptop and so I'm not sure what the problem is. 

When I tried to go into Game Options it said that I was in full screen mode and the mouse was acting as if I was as well. Every time I tried to change it or even go into Window Mode to see if that might help, the problem just got worse.

I don't know if I'm explaining this very well, sorry. It's just frustrating because everything I've looked up and tried hasn't worked. I don't know if it's a problem with my game or possibly my laptop? It's just a MacBook Air 2020 and Sims is the only game I have on it. Nothing's wrong with the actual game play or save files, just the screen being the wrong size and the pointer...

A screenshot of what I mean when I say it's all out of proportion. Usually when I play you can't see the dock or the top bar part at all. And I have to hover the mouse down before I'm able to click on the option I want...