Setting up the Navigation with Cubist
The sidebar navigation works seamlessly with any size screen. Choose to show the top level items and select "relevant subpages" and your choice for the third option. See the graphic to understand the settings.
Using the dashboard theme control page you can set your theme to display to 5 preset widths. Simply choose which you want and click save. The mobile version will still scale beautifully with your screen size
Choosing a Font Face
The dashboard page also gives you the option to change your fonts on a sitewide basis for your particular site. Choose from the dropdown list for both Header items and Body text. What one not included? Simply drop a support ticket and I'll add your option from any of the Google font families. You can see their fonts here. Default fonts are Dancing Script and PT Sans.