Hello,
im using wordpress 5.4 , and i tried to change several themes but the same problem...the origina font of the theme does not load , and when i try to change the font from "customize" the font list is empty! by the way i use "Import Customiser" and i tried to disable all other plugins but the same result
Regards,
Mahmoud
Are you disable all third party plugin although if not working can add custom font follow
this tip :
https://wplms.io/support/knowledge-base/add-custom-fonts-in-wplms/
Thanks,