Controlling pagination on tablet

I have a score which I uploaded, and in MusicScore Studio it is displayed on two pages, the first with four staves and the second with the remaining fifth staff.

When I display this on my tablet (Google Pixel Tablet) in portrait mode, it squashes the whole piece onto four staves, quite small, filling up only half the vertical size. When I display it in landscape mode, it compresses it to three staves, also quite small.

How can I tell the player running on the tablet to paginate in the same way as in the editor, or at least to increase the font size so it's closer to how it looks on the editor, which is how I want it (I have carefully stretched various parts of the piece to get it looking how I want it).