Lightroom Classic 2018: After clicking Done with a brush, when you click a brush again, the dots do not reappear

Exactly as the title says: After clicking Done with a brush, when you click a Brush again, the dots do not reappear.  I tried adjusting brush size to see if that would help detect or pick up the other brush dots, but no such luck.  It's like the changes I made the brush previously are now baked-in.  The only way to change them is to reset and start over. This is the desktop application, on the latest update.