Zoom suddenly started sharing my whole desktop today

[cchapman]

I use Zoom everyday to share my screen from my Macbook to my work desktop to the screen (I'm a teacher). Today, I noticed that it was not only switching sharing between my Firefox windows (not tabs, but actual windows) and then also to test, it shared with Finder. This worries me because I often have sensitive student data (like work emails or IEP's).

Restarting Zoom ended it, but it scares me that it even happened in the first place. Anyone else have this problem or know how to fix it?