One day I was surfing the web when suddenly a large clear square appeared around my cursor!
I honestly don't know what to do about it, but it seems like there could be a simple fix.
You can see in the picture below what the box around my cursor looks like compared to the normal screen.
Is there something I can reset or do to clear the box that encircles my cursor?
Could this be the Zoom accessibility feature?
It can be toggled with Alt-Command-8.
Also see System Preferences => Accessibility => Zoom for more details and options.
I just had this problem. I tried everything in Accessibility but I just couldn't figure it out. I was going to give up, but discovered I was leaving out one step. This is what I did and it worked!!
Go to System Preferences => Accessibility => Zoom. Scroll down to Zoom style: You will see two frames. The first one has two options 1) Full screen or 2) Picture in picture. Next to that should be another frame showing OPTIONS. Click on Options. It will show a checklist. The first one is Show Preview rectangle when zoomed out. Deselect it. I did all the steps above and Poof, the rectangle disappeared. Good luck.
As Thilo said it is probably an accessibility feature, to expand a bit go to accessibility in system preferences, select zoom, towards the bottom is zoom style, make sure it is set to full screen not picture-in-a-picture.
Go to system preferences-accessability-zoom tab-and make sure you uncheck the box "use keyboard shortcuts to zoom" thats what worked for me.
