[Zubersoft]

By default, MobileSheets should be scaling the page to fit the screen. If you want to zoom out beyond 100%, you can go to Settings->Display Settings and enable "Allow zoom out past 100%", or you can bring up the song overlay by tapping in the of the page, tap the display mode icon at the bottom (to the left of the page scaling icon with blue arrows) and toggle the setting there.

Mike