Can not convert first button board Tab to Window

[Light_user]

I have 1 button board ready to use but i want it to make a button window so i have no menu bar or other things i dont need in live mode.
I can only create a second button board as 'window' type, the 1st (default) button board cant be changed to window mode. It jumps back to 'tab' mode when applying 'window' mode.

[Niffo]

First button tab can not be a window.

[Light_user]

Then there is another bug: viewtopic.php?f=75&t=4872