Pagination and Layout

Hi.

I’m new here and am loving Scrivener!
I am building my first project and imported all the text from WriteItNow.
Everything is running well until I made the first compilation.

I realized that the margins are complete nonsense; the vertical spacing is huge and I don’t know how to manage it.

I am scared to imagine that I have to start all over again from the beginning.
Can you please help me?

Thank you so much,
Rui Freitas

Bellow a picture of a compiled page of the project: