you can adjust showing rows and cols of bars.if your cursor place to showing popbar action buttons then hiding row & cols may show.
It was part of Cosmos UI. but Mugendai, original author doesn't work this anymore.
I just fixed it for WoW 2.0 and TBC.
type /popbar or /pb to show configuration window.
* added bar scale option.
* now correctly popup in combat.
* now correctly work turn pages option.
* no longer use Clickbinder lib. now use Blizzard keybinding UI. (you must re-bind your shortcuts)
* Fixed to flip horizonal axis option
* Fixed to block error issue when override enchating
* Removed flip vertical axis option (not work anymore)
* Fixed for WoW 2.0 and TBC beta
* Added to Korean localization
* Added to internal cooldown count
* New key binding system by Gello's ClickBinder