What causes the iPad to show
Bookmarks are being synced. Please add the bookmarks once syncing has completed
when attempting to add a bookmark or favorite in Safari and how can it be prevented?
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Your iPad or any iOS/macOS device logged into an iCloud with Safari sharing in
Settings -> iCloud -> Safari will sync history, bookmarks, and logins. Any changes to the bookmarks will trigger the sync, forcing you to wait. Its a pain in the arse to manage bookmarks with this always popping up.
Disable the syncing in your iCloud settings under Safari.