Learn how to configure the theme header here. In your control panel, go to Storefront > Themes, and click the blue "Customize" button to launch Theme Editor. In the left hand column of the Theme Editor, click the panel labelled 'Header'
Text Based Logo
Configure the size and color of your text based logo here.
Show Phone Number
If you have set up a phone number in the Store Profile area of the BigCommerce Control Panel, checking this option will show the phone number in the header.
You can change the icon used in the utility navigation between a bag, cart and basket icon.
Cart counter background color
Choose the background color of the cart counter (where the number of items in the cart is displayed).