Yeah I put that window together a while ago, and just kind of updated it once for the PVP request. I used my experience bar hardly ever. Glad you got it working.
Here's kind of the infograph I made a while back for those buttons. It's kind of like "sorting" but without drag'n'drop:
I realize to get it exactly how you want can be interesting, but I'm sure you can figure it out. Window resize is then the way to "hide" bars.
Optimally I would update the window to use the DrumsUI settings and make it more customizable, etc. But probably won't be happening (at least not now).