Step 1 - In Advanced Mode, click Edit Fonts.
Step 2 - Select Choose Custom Fonts in the top right corner.
Step 3 - Select which font option you wish to change and make the appropriate edits. If you make a change to a font category, your page should show you what the font change will look like before saving.
The Titles font will update the title of the form, as well as field property name (in the example below it would effect the title Annual Potluck 2017 and field property Person's Name).
The Main Body text font will effect the entire font for the form.
The Buttons font will change the field options (in the example below First Name, Last Name, Email, & Phone Number).