I seem to have succeeded in removing all photo files and folders from the Organizer. However, I did get the message "Clear applied filter and try again" when it said "No Media Available." I read Community posts and found that if I want to import photos or see ones I want to see, I should check the boxes in View Media Types and, perhaps, View Timeline.
But if I want to keep my photos deleted. Then I want to re-import "good" ones from an external hard drive or card reader. Before doing that, I assume that I should make sure theView Media Types and View Timeline boxes are checked. Am I right?