I keep expecting to find a little X button on the titlebar of each side panel.
I'm looking at the panel thinking "I don't want to see that just now", then to close it I have to switch attention to the buttons at bottom right and work out which button is for which panel.
That and the overlap on the right side with searched-for nodes being hidden under that sidebar so that I end up looking all over and then remove the side bar to finally find the node that was found.