This addon hides the micro menu, bag buttons, xp, artifact, honor and reputation bars, and reveal them when mousing over, with the intention to clean the screen and reduce distractions.
It also trims the action bars to make it look better with those things hidden, including a "compact" mode to make the bars and menu fit together.
To toggle compact mode on/off type /compact and then reload the UI.
If you're having issues with the compact mode while re-scaling the interface or with some other addon, either try to reload the UI or turn the compact mode off and use on its default mode.