If you would like two logos - one for desktop devices, and another version for mobile - you have the option to upload a mobile logo.
To add a mobile logo:
- Log in to WordPress by adding '/sl-login/' to the end of your website's URL and entering your credentials
- From the Dashboard go to Appearance > Customize > Branding
- Find the section Mobile Logo and click Change Image
- Either upload a new logo, or select a logo from the Media Library
- Hit the blue Save button