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Ever since I upgraded to macOS High Sierra, I’ve had a black rectangle on my screen:

empty rectangle with black border and white border around it

My cursor started out inside it, and when I try to move my cursor outside of it, it follows my cursor:

GIF of behavior

I’ve tried restarting and quitting all of my other apps, it still shows up.

If I switch the “Zoom style” in System preferences → Accessibility → Zoom to “Picture-in-picture,” the box still shows up, but it stops following my cursor.

How can I get rid of this annoying box?

2

It turns out that this is actually a “feature.” There’s an option in System Preferences → Accessibility → Zoom → Options…:

Show preview rectangle when zoomed out

Unchecking that should remove the rectangle.

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