A Theme defines the look and feel of the application, including what layout is used in it.
Singlebag comes with features of default customizable themes that allows you to design your site for enhancing the overall look, feel and style of your website. When you make changes to your theme, it doesn’t affect the other parts of your account. You can play around with different theme styles and settings without worrying about the rest of the content in your admin.
To setup theme, navigate to Settings > Themes > Activate
Select the theme and click activate, it will display the store front UI design.