Hi Dashingw!
That's very strange...the way the theme is set-up makes it "impossible" to happen (way to speak, I believe what you're telling me of course!), the rule being to strictly occupy the width of the monitor!
Would you be in a multi-monitor set-up?
If so, try to disconnect one of the monitor and launch mGalaxy in a single monitor set-up, then report to me please!