You can edit the format that your answers are shown in using the formatting Bar, or the formatting menu.
Click "Format Bar" in the toolbar, or choose "Show Formatting Bar" from the "View" menu.
Notes
You can setup the default formatting options to be used by the first line of a new document in the "Formatting" pane of the Preferences. Subsequent lines will take their formatting options from the previous line.
You can change the formatting for multiple lines by selecting them in the text editor or the answer column, and making the changes using the Format bar or menu.