I feel kind of dumb, guys. I fixed this issue thanks to Kyle's guidance, but now I cannot for the life of me figure out where to put the css to hide the number of registered members in my lists.

I know the css I need is:
.cbUserListResultCount {
display: none !important;
}

The code that controls the display of "[SITENAME] has # registered members" is in public_html > components > com_comprofiler > plugins > templates > default.php. So after watching Nick's excellent template override tutorial I figured I'd create an override file in the default template folder.

override.css didn't work, nor did override.php.

I cleared the Joomla cache a couple of times. Still no change.

I guess I might mention here that I'm using a Gantry 5 template, just in case that makes a difference. I also tried to add the code to my custom.css files in the joomla template custom folder. (UPDATE: I think I need to recompile the CSS. I'll try that tomorrow...or later today.)

I think though it might be nice to have this customization in the CB template folder, which would maintain it if I decide to change joomla templates.

So what am I not doing this time that worked so well a few months ago?

Yay! It worked.

There was a custom folder for my template and the Gantry folks provided some guidance: Gantry 5: Add Custom Style Sheet

Created an scss file in the custom folder as directed. Pasted the css Kyle provided here on this forum. Went to my Gantry template in the administrator and clicked on Recompile CSS.

Voila! The lines are gone from my member lists.

I'm adding this procedure to a file for myself so I can recreate if/when I change templates.

Thank you, Kyle! Again!