Beat Designer window

Beat Designer opens in Full screen mode. How can i open as a resizeable window?

what is your screen resolution?

My resolution is 1768 x 992

I found out: right mouseclick anywhere, In German language it says: Immer im Vordergrund, don’t know the Ebglich version. This you can check or uncheck. For resize the window it must be checked! If it is unchecked you only get fullscreen. If checked, you can resize the window from every side or corner. That’s it.