I spend significant amounts of time choosing multiple slides with the shift and or control key, and then I cannot undo it, and properly get back to highlighting one slide only. I know this is happening for many people. Is there a magic way to undo all selected items. Clicking a blank space does not do it. I save the project. Re-open the project. Happens constantly. 15% time lost on this one problem. Is it going to be fixed?
Sorry you have this problem.
Clicking on a blank part of the canvas does and should cancel your multi select.
We may need to take a look at the issue you're experiencing as a support question.
I will convert this Idea to a support question.