The Font dialog box allows you to format text in a variety of ways, including size, style, color, and more.
In Font options, choosing +Body or +Headings gives you flexibility to instantly overhaul the look of your document with Themes (in the Design tab). Themes work as a coordinated set of colors and fonts, saving you the time of having to pick out different fonts, colors, and so forth, one by one.
Select Set as Default if you want your text to default to the choices you made in the Font dialog box.
Select Text Effects to apply special formatting like a shadow, reflection, and colors for the fill and outline of text characters.
For more details, see The Font dialog box.