Formatting

Reduce the spacing on Format > Page settings

You should find something that helps in this part of the handbook https://musescore.org/en/handbook/4/formatting

I suggest you might want to change the scaling in Format>Page Settings which will make everything smaller and so more can fit on a page. But there are other things you can try.

If you are still having problems, come back and attach a copy of the score (.mscz file) rather than a picture so that someone can see what settings you are using.