If I select a portion of an image, then turn on the Mask Overlay, I can use the Brush Mask tool to "paint" over additional areas I want to mask. How do I unmask areas with the same ease?
When the Brush Mask tool is selected, you should see the "modes" your can use on its Property bar. Normal (arrow), Additive(+), Subtractive (-) and Overlap. What you want is Subtractive mode.
I appreciate you both replying! I figured out how to do it about 5 minutes after I posted my question, and I thought I deleted it.