Hitting "H" does not seem to reactivate the feature.
In one of the drop down menus in the upper left of the LR window (i.e., under File, Edit, Develop, Settings, etc.), what command should I be looking for?
Are we talking "tool overlay" here?
Toggling "tool overlay" does involve the "H" key to deactivate it; "Cntrl + Shift+ H" to activate it.
I'll give it a try.
That did the trick!
Thanks for leading me to the solution!