Can I suggest you put a hint in the tool tip, that's one of the primary ways I learn shortcuts, the other is by reading the doco, remembering what I wrote somewhere three months ago comes a poor third.
Hopefully it will help DrivingTest
BR
Puzzle (for me) Solved: I would have downloaded PE from https://sigil-ebook.com/pageedit/download/
I see now that the shortcuts are documented on the https://github.com/Sigil-Ebook/PageEdit/releases page. So, in future, instead of clicking on the big green button I'll go there so I can read the release notes.