Retailsy Premium – Header Setup
Go to WP Menu => Appearance => Customize => Click on Header => Site Identity
In site identity, you can add a logo and you can set logo width accordingly.
Go to WP Menu => Appearance => Customize => Click on Header => Header Navigation
If You want to Manage and Customize Right side header Navigation Area.
As You can See In Given below Image how can you manage header Navigation Area From Customizer.