To hide that option, open the settings --> "Access Control" --> "Form Entry Settings" --> uncheck "Project settings" (you can hide other things as well and set an admin password if you want to prevent a user from trying to change things).
Welcome to the ODK forum, @anguedez! We're glad you're here. When you get a chance, please introduce yourself on this forum thread. I'd also encourage you to add a picture as your avatar because it helps build community!