Second issue, App rights to Files and Folders in MACOS Catalina.
Outside of LR, on your MAC, in the MACOS, bring up System Preferences, select Security and Privacy, select the Privacy tab, scroll down to Files and Folders, make sure Lightroom has access to all the drives listed.
Scroll up to Photos, assuming you store photos in the MACOS folder Photos, make sure LR can access that folder.
Thank you for the feedback, and the links. I decided to stay with a Classic because, at least originally, there was no monthly subscriptions: you just bought the software and occasional upgrades, which I’ve done for years. Now I see I need a subscription for Classic! Not happy. My time with Lightroom has come to an end. I’ll find other software that doesn’t tie me to a subscription. At least the current lockdown situation gives me the time to research other solutions, and clime a new learning curve!