I have a laptop with Ubuntu installed on it and I'm constantly switching from just my laptop to also having a monitor. When I'm using the laptop screen and monitor, I have a panel on each monitor that shows the windows open for that monitor. If I switch to just using the laptop screen, then both panels end up on the same screen. How can I configure one of the panels to only show up if I have two monitors? Or can I at least "suspend" one of the panels somehow so I don't have to set it up the way I like it every time I switch?