NOTE: A module with a different font set in the Design settings tab will override the global font for that module.
Step 1:
Log in to your WP Admin panel.
yourdomainname/admin
Step 2:
Navigate to Divi>Theme Customizer.
You can do this from the Admin Panel menu,
OR from the front using the editing bar.
Step 3:
Select “General Settings”.
Step 4:
Then select “Typography”.
Step 5:
From here you can globally change the website’s default font settings. Save and publish changes.