A. 1. Clear app cache: Go to Settings > General > iPhone Storage, find Paperback, and select 'Offload App'. This can help refresh the app’s data and remove any remnants of uninstalled extensions.
2. Restart the app: Close the app completely and reopen it to refresh the data.
B. 3. Check for app updates: Sometimes, bugs related to uninstalled extensions are fixed in updates, so keep the app updated through the App Store.