My workflow is to make annotations during rehearsals (sometimes gigs) and then process all annotations into the master sources. After verification, I have to change to the eraser tool and select/remove each individual annotation one by one. it would be very handy to have an option to remove all annotations from the current page of a song.
Enter the annotations editor, then make sure you have "Show List" enabled from the list at the top left. Select the selection tool (arrow) and then in the list on the side, tap the select all button at the bottom left (square with four dots) then hit the trash can. That will delete everything. You can also just use the eraser to drag a rectangle over the whole screen which will erase everything at once.
