I added the favicon according to this tutorial: https://help.shopify.com/en/manual/online-store/legacy/using-themes/change-the-layout/theme-settings...
In the theme editor toolbar, click the Theme settings tab.
In the Favicon image area, click Select image.
To select an image that you have already uploaded to your Shopify admin, click the Library tab. To select an image from your computer, click the Library tab, and then click the + button.
When opening a new tab, the favicon of the site appears.
Unfortunately, the favicon doesn't appear under frequently visited pages (e.g. in Safari - see print screen). Can someone help me with this please? Thank you in advance!