thanks for give us the possibility to test the improvements of the new beta.
I have had installed it few moments ago, and I like to make a suggestion about the Additional workspace are.
At first, the german translation of "Additional" is "Zusätzlicher Arbeitsbereich". So far it isn't implemented.
So let's go to my suggesstion (see screenshot)
1 - The title bar of the additional area doesn't contains any text. Maybe "Additional workzone" (or "Zusätzlicher Arbeitsbereich" in german) would be an idea.
2 - By minimizing the main window of RB the additional workspace minimizes, too. For computers with multiple displays this isn't useful. Maybe you should make it possible to add a separate entry to the Windows Taskbar, so that the main window can be minimized independently (like the music library).
Have a nice day