Hello,

In order to control the size of the blog’s title is enough to use the Advanced typography functionality. Please, navigate to Theme Settings -> Typography -> Advanced typography -> create a rule with the “Blog post title” item and set any font size for it.

https://monosnap.com/file/f55BxFF89cHCUxCtqZQE45GRMSUfAi

Please let us know if there is anything further we can assist you with!

Kind Regards