The tool bar is where most magic starts, so it should be something really simple, easy access and unintrusive but yours has too many items and takes valuable space from the screen, mainly if we are landscape. Could use the top bar wheres the document title to integrate the toolbar there and the title of the document would be somewhere else, again, notability does this perfectly
And also plz, let us move the tool bar to the bottom without moving the entire top bar with it