Typography
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Go to Sales channels > Online Store > Themes > Customize
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Click on the 'Theme Settings' in the leftmost bar
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You will see the list of theme settings, click on 'Typography', you will see font inside heading
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Click on the 'Change' dropdown, you will see list of fonts available
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Choose font from the list and click on 'Select' button
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Click on Save button. And you can see the updated font in the content in your site