Dumb question - how do I get a score with a white background (not gray)?

I notice that on YouTube Musescore tutorials, the scores being constructed and shown all have nice white backgrounds, whereas when I create a new score, the background is always gray.

I am putting together a set of music instruction videos using examples created with Musescore, and for aesthetic reasons I really need the scores to be created against white backgrounds.

In many cases, my examples are not full scores, but only a couple of measures.

Can someone help me? Is there a way I can make the scores/examples have white backgrounds instead of gray?

I'll appreciate the help.