Some of the fonts available on the Google Web font list might not be available in Divi by default. To ensure that all the available Google fonts are also available in Divi, the Google Maps API key needs to be adjusted to include the Google Fonts API.
Add the Google Fonts API key to the existing Google Maps API.
Login to your Google Cloud account
Load the project that contains the Google Maps API Key
Use the navigation menu and open the APIs & Services → Enabled APIs & Services
Click on Enable APIs and Services
Use the Search field and search for Google Fonts
Click on the Search Result called Web Fonts Developer API
Click on Enable button
At this point, the Web Fonts Developer API will be added to the existing Google Maps API.
Go back to WordPress Dashboard → Divi → Theme Options → General Tab and resave your settings.