TAB Application showing on partial screen

Hi, when I call (or run) my tab-application it runs on a partial screen. In development or deployed, makes no difference. Tried Chrome, Mozilla, Opera and the new Edge bowser. I had the same issue with a menu application but there it went away with an update of scriptcase (and came back and went anway). Was related to an update of the browser …

I can not find a lot of info about this problem. Is there any command (even javascript) to force the tab-application in using the complete screen?

regards,
Patrick