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Go Into Project Settings (Edit → Project Settings]. Type in ‘default maps’ and set desired level in Editor Startup Map and Game Default Map.
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Open up World Partition Tab [Window → World Partition → World Partition Editor]. Select desired cell in World Partition Tab and right click and use Load Selected Cells.
- Save All or Level [File → Save Current Level] or [File → Save All] (I did both). After, Reopen Project [File → Open Project] and you should see your actors loaded on the map.
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Select desired Actors in World Outliner then delete. After delete save like before [File → Save Current Level] or [File → Save All]. If you have a lot of items there will be a loading bar saying ‘Cleaning External Actors’.
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Reopen Project again and they should be gone.
Hopefully this helps and good luck.