[Zubersoft]

I have the same version installed on my BOOX Max Lumi, and if I go to Settings->Library Settings->Switch Library, there is a big black plus icon at the top right of the screen. I may need to see a screenshot from your device if you don't see that, as I'm not sure how else to explain it. Please turn off any optimizations in the OS that could impact the visuals in MobileSheets (long press the MobileSheets icon on the home page, tap "Optimize" and turn off things like "Bold fonts").

Mike