Sims 4 zoomed way in

My Kids play Sims 4 on an iMac, OSX 10.9.5, 3.06 GHz Intel Core Duo. The last time, just before the game was shut down, one of them managed to screw up some screen setting or other: everything was blown up in size, and the cursor got stuck on being the + zoom tool. The entire computer screen - desk top, all other applications active at the time - were effected as wel.

The only way we found we could close down the game was by force-stop, and that solved the problem for the rest of the system as well, but as soon as we open Sims 4 up again (either direct from the applications shortcut or from within Origin) the issue pops up again.

I'm guessing the kid accidentally activated a key stroke shortcut that enlarged the view, but I don't know what button combo that might be, or what I can do within the game menu to put this right. Remember, the cursor doesn't work as it normally would, so it won't click on menu items.

Any help appreciated.