While clicking toolbar icons such as
They open right the board, docked.
If you close the last one, the board will take all the screen. Clicking again the toolbar icon will open the window docked as a "tab" behind the board.
It is very counter intuitive to move window around to put it back side by side with the board. Actually I could never accomplish that. I usually go to Options/Windows/Restore layout.
Thanks for taking a look at this.