Theme settings > Typography
You can:
  • Enter a font name for font-family
  • Select a number of font-weight, font-style & font-size for: Body, Heading & Sub Title
Body font settings
Heading font settings
Sub title font settings
Gecko only support Google font. If you want to apply a custom font, You can use this App Fontify – Customize Fonts for your Shopify store​

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