[steve_g]

Go to Settings->Display Settings and uncheck "Fullscreen Mode" at the bottom. Then MobileSheets will come up in windowed mode. You can toggle between fullscreen and windowed mode by hitting f11 or tapping the fullscreen icon in the floating toolbar at the bottom right corner of the library screen.

Mike

Thanks for your reply. 

I do have "Fullscreen Mode"  unchecked. 

It seems to depend on how I launch the app.  

If it is launched from 
- the Windows Start menu, via either an icon or a shortcut in the programs list it always launches maximized.
- an icon on the desktop, it launches as a non-maximized window, and correctly recalls its previous coordinates. 

I have a workaround for this now, that I sussed out while testing for my reply to you, it would be nice to understand the behavior, and whether it's possible to configure. 

Thanks again. 

Steve