There are 2 modes (fullscreen and embedded). They are slightly different, so you may install only one or both.

•First screenshot is fullscreen mode

•Second screenshot is embedded mode

How to install?

I. Find MusicBee Directory

II. Depends on which file you want to install

1 - To install fullscreen:
put Dimkanet.xml file in MusicBee\Plugins\TheaterMode.List\

2 - To install embedded:
put Dimkanet (embedded).xml in MusicBee\Plugins\TheaterMode.Embeded\

P.S. Used Chimera.skin theatre mode as basis, thanks to InLurker for a core code I could work with.