I loved the popup toolbar because when I’m working on my laptop I don’t have a lot of room on the screen for the side panels and tend to keep them closed - the new tool pane just takes too much space.
Would it be possible to have an option to choose between having a toolbar or the pane?
If not, then perhaps you could consider an option to display all the icons in the pane as a single line so that the pane could be docked above/below the main editing pane, taking up very little space?