I recorded some videos on different slides. After that I deleted some slides and saved the project under different names. But I noticed that the file size remained the same.
I think the reason is that it is possible to UNDO the deleting, so the deleted slides and videos must be kept. But I want to have small files (and short file writing time, too 
and so I want to delete the “changes history”. Is it possible?
I found the answer myself. It is under ActivePresenter > Project > Shrink … (in German “Schrumpfen …”).
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