After trying everything I could possibly do, I just gave up and had to turn off ALL monitoring. Now I don't get notifications.
Turning off Notifications in the Android Smart Home App didn't work.
Turning off Notifications in the Smart Home TV app didn't work.
Turning off Notifications in the Web Smart Home page didn't work.
Setting a Rule in the Android App to only engage limited monitoring for one minute each day - right before midnight - didn't work.
Also, the Smart Home Web View of my cameras still says "Camera is not supported on this browser", though that's a different complaint and posting.
Also, now I can't use finger gestures to zoom in and out in the Android App. Tried un-installing and re-installing Smart Home, but still no luck.
The only working feature left is that the cameras do, at least, show what's there. That's pretty Dumbed-Down from what they're supposed to do, and I have an annual subscription, too.
Roku Support and this forum have been of no help, so I'm thinking that Roku engineering is just very, very shoddy.
Will post this as a rating on Amazon to warn others away from Roku.