Your documentation for embedding and/or changing Googlefonts for T3 do not match the new Joomla 4 interface. How do I change the Googlefont which come with the Kids Corner quickstart?
Here is doc for how to add font in T3 based template: https://www.t3-framework.org/documentation/bs3-customization#add-fonts
It should be the same in J4.
You can share the URL + super admin account of your site and tell me the font / where you added so I can check.