Jürgen H. asks:
I’m terribly annoyed with myself. I had already finished my presentation and just wanted to change one or two small things. Then I saved the changes and closed the presentation file. Unfortunately, the old version was gone. Is there a trick I can use to keep a slide and still make changes?
Hiroshi Nakanishi answers:
Dear Mr. H., first make a copy of the slide you want to change and make the changes on the copy. If ...
