Apologies I had forgotten you could even resize that control. You can do the following:
Make sure LaunchBox is closed
Go to \\LaunchBox\Data\Settings.xml and open it in a text editor
Look for the "ControlsBarHeight" tag, and set it to 56, then save and close the file
Reopen LaunchBox
This should being that bar down so you can resize it back to whatever your setting was.