I don't know what's causing this. For instance, I am unsure if it happened before I updated to Big Sur, so I don't want to blame that. I may have changed a setting somewhere. I'm still doing some learning about using Mac. When I am in the Doc, I hit VO+SHIFT+M, but the menu to work with Doc items sounds like it opens, but VoiceOver suddenly lands on the Desktop. As far as I can tell, the Doc is the only place I don't get this menu to come up. For instance, I can make it come up in Finder when I work with files and see those options.
If anyone has something to try to fix this, I'd be grateful.
This is a known bug in Big Sur. The only workaround is to route the mouse pointer to an app in the dock with VO-Command-F5, or VO-Function-5 if you're using a Mac with a Touch Bar, and clicking the mouse while holding down the Control key.