By default, Facebook always has the right to share your albums when you grant the app permission to access them. Facebook frequently suggests sharing photos or videos from those albums while you're browsing your newsfeed or interacting with the app. This is something you definitely won't like because it infringes on your privacy.
To disable Facebook's album sharing permissions, go to Facebook Settings , then select the option "Suggested sharing based on library" .
Next, turn off the setting "View photo library suggestions when you browse Facebook . "
After you turn this setting off, Facebook will no longer suggest exporting photos/videos from your private albums, and you won't be prompted to share images you don't want to make public anymore.