[Andrew9999]

You can move the window and MobileSheets will remember where you moved it. Just drag the move icon at the top right or just drag the title at the top (either will work). You can also resize the window using the icon at the bottom right if needed.

Mike

Thanks Mike - but whatever the size of the main window, if I have a floating library window to one side, then there will be a white space on the other side as I illustrate. I've attached what this might look like if it were "fixed".

The only solution appears to be to hide the floating window when playing, and then show it again when not.  But if I'm going to do that I may as well simply return to the main library list.