App Hung

The app is hung, after creating some sort of half-window. On the tassk bar, only half a window is displayed, and in the alt-tab selection strip, again there is only half a window with a small white box in it. No idea what that even means. Power BI is alive, but just dings when I try to click on it. The half-window won't close.

I can probably kill the app and try to recover my work, but if there is a way of bringing this to the support team's attention for a proper fix, that would be nice. 🙂