Some CBSubs usage questions

With that parameter enabled it won't list all. It'll just clear the criteria. There's no parameter to completely get rid of List All. Best I can suggest is hiding it with the below CSS.

Where do I add the custom css? I am used to adding custom css to my Joomla template under their "custom.css" file. Does it go in the same spot?

Question- I added plans that I do not want shown on the registration page, but I still want to be able to add people manually under this plan. When I go to User Management and add a new person manually, the hidden plans are not shown.

Your Joomla template CSS file or CB template override will work fine. In your case custom.css is probably fine.

Question- I added plans that I do not want shown on the registration page, but I still want to be able to add people manually under this plan. When I go to User Management and add a new person manually, the hidden plans are not shown.

If it's a backend only plan then under "Access" set "Allow access from site frontend" to "No: this plan is not visible in site, only in admin backend". Alternative is to just edit them after creating them an adding the plan at that point.

The plans do say "No: this plan is not visible in site, only in admin backend" and I still don't see them.

Even at this point, when I try to edit her, no plans show up. See screenshot.

Under Workflows ensure your plan is set to display on registration for it to be available to new users. For it to be available to existing ensure it's set to allow updates on the Workflows tab.

So once someone is in the system, I cannot change their membership plan on the backend?