If bookmarks are missing from the Favourites bar in Safari on Mac
If you didn’t accidentally delete the bookmarks, try these suggestions.
In the Safari app on your Mac, make sure all the bookmarks in the Favourites bar are displayed.
If you see angle brackets at the right end of the bar, click them to show the rest of your bookmarks or widen the Safari window. If you don’t see the bar at all, choose View > Show Favourites Bar.
Some features, such as adding bookmarks for specific sites, may not be available if Screen Time browser restrictions are set for your account. Check with a person who has an administrator account on your Mac.
If your Mac has Safari enabled in iCloud Preferences, you may have removed the bookmarks on another device.