Favicon is an icon that appears next to your store name, browser tab or address bar.
It will also appear under the Favorites tab.
1. Prepare a 16x16 or 32x32 pixel PNG file.
2. Go to 'Layout' > Click on the three dots > Click on 'HTML editor'.
3. Go to the section 'Assets'.
4. Click on 'Add a file' at the bottom of the list and upload your file prepared in step one.