Have you tried this with a new catalog?
If this does not help try to reset Lightroom preferences. Please refer to below article.
Kindly backup any presets, addons, brushes etc prior to resetting preferences.
GautamBahl and trshaner - thank you both for responding to my question and so quickly!
I clicked the little ON/OFF slider and that was all it took. I am feeling kind of silly for not figuring it out myself.
There are no silly questions–LR is like a Swiss Army Knife. Sometimes it takes a bit of digging to find the right tool and figure out how to use it!