While editing, you can make mistakes that you don't realize right away. One of these is cropping off part of a word that you didn't mean to.
If you don't notice right away, you could be convinced that you needed to undo all of your edits up to that point but that's not the case! When you ripple delete in ScreenFlow, it saves the portion of the clip that you deleted. All you have to do to recover that clip is to select the clip and drag it. Then you can make your desired edits again
Zac Jones: [0:00] I'm in ScreenFlow, and I just noticed that I clipped off a word here. What I can do is drag these sections over and select the section that I want to recover, drag this back out, and now, brown fox jumps. I have the forward, so I can drag these back and clip up to the word, ripple delete, and now I have my audio fixed without having to mess with any other edits.