We're sorry about the trouble with Lightroom Classic. Please go to the System Preferences for your Mac, then Security and Privacy, then select the Privacy tab. Then select Accessibility from the list to the left & check if Lightroom Classic is added to the list with a check mark in front of it. If not, please add it by unlocking the window first using the lock at the bottom left, then clicking the + icon & navigating to the Applications folder. Also, grant permissions to Lightroom Classic under Full disk access located in the same list as Accessibility. Once done, restart the Mac & check if it helps.