I'm having an odd problem where the Mac Photos app on a Catalina VM is not showing the "Photos" tab on the sidebar. The sidebar under library shows Memories, People, Places, Recents, Imports and I can see the photos under recents/imports but the Photo option to browse is not there. If I copy a Photos library file from a Catalina machine (non-VM) where the Photos tab is visible to a Catalina VM and open it disappears. If you are running a Catalina VM start Photos and tell me whether you see in the Photo tab in the sidebar library section or if it starts with Memories on top. Also tell me what you host OS is. I am running Parallels desktop version 15 and the host os is Mojave. BTW - it seems to work on Mojave VM fine and if I upgrade that Mojave VM to Catalina is disappears.