Thank you for contacting Webriti Support! My name is Akhilesh and I'll be more than happy to help you today. We appreciate you being patient with us.
In our Busiprof theme we don't give setting for typography .
To change font size and color, You can use Additional css box .
Let me know on which section font size and color would you want to change.
To change font style refer this link.
Right now in our theme we have used three fonts.
Let me know for further assistance.