This is a pretty small thing, but it has tripped me up a couple times, so I thought I’d post it.
When I click on the frame tool, then select one of the three frames in preparation for drawing a new one… and then switch to a different tool… the frame stays loaded on the mouse. The only way you know is when you click on the score.
Not sure if this is intentional. It would seem to make more sense if switching tools “unloaded” the frame from the mouse.