I went to the settings and unchecked the thing that will make the ones go under "More..."
My question. Is there any way (only certain themes, perhaps) to change the font or font size or spread the navigation so all my tabs are on the same page? Currently it stops a little bit past halfway and then starts a seond row.
You'd probably need to customize the theme to expand the width available for your navigation links. Depending on the page names, you can sometimes squeeze another word or two in by choosing shorter page titles, too. A third option is your suggestion of switching to a different theme.