[itsme]

If you use the cropping function of MobileSheets nothing is changed in the PDF. Just the cropping frame is stored in the library of MobileSheets. You can change or remove the cropping at any time. Then choose a "page scaling mode" to enlarge the page, "fit screen" or "fit width" are probably a good choice. Note that there is a default setting and an individual setting per song and be aware that there are independent setting for the tablet in portrait and in landscape orientation.
I use "page scaling mode" = "fit screen" and "display mode" = "single page" as default for portrait orientation.
In printed fakebooks it happens every now and then that a song has a small part on the left page and another part on the right. In this case I switch (for these songs only) to "page scaling mode" = "fit width" and "display mode" = "vertical scrolling"
Play around and understand these settings and find the way that fits your needs best.