Hi Nguyễn Anh,
There are 2 font family options for the Theme. One for Headings and the second option is for content. You can find the Option on ‘Appearance > Customize > Typography >Font Family’. Font for heading will make an effect on the entire heading of the Theme. And we want you to know that our NewsCard Theme is already using the ‘Robot’ Font as a default.
If you are using another font family for Heading and you want to change the font family for subheadings, you need to customize the code by adding extra Font Family code to work for the subheading which need extra CSS code to set font family for the subheading.
Note: Using many Font Family will increase the Page load time and we recommend making a child theme first before customizing the Theme code so that you won’t lose your customized code when updating the theme to a newer version in the future.