To disable the loading of Google fonts, you will need to do that under Popup Maker > Settings > Misc (miscellaneous; tab) > Assets (category) and check the Don’t Load Google Fonts box. To make it more clear for you, please see this screencast: https://share.getcloudapp.com/rRun4pAJ
https://wordpress.org/support/topic/avoid-loading-google-fonts/
