Typography, also one important subject! The typography settings contain the settings for your font/typograhpy across your webshop.
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To edit your Typography settings you'll have to navigate to the settings.
Click on the 'Theme settings' in the left sidebar, its indicated with the following icon:

When clicked, on the right sidebar your theme settings will open:
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Now click on 'Typograhpy', the following settings will open:
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Headings fontsize on mobile:
Set the font size for the headings on mobile devices here, the options are: Small, medium, large, extra large.
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​Heading font:
Choose your font for your headings here.
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​Body text font:
Choose your font for your body text here.
​Body text are your normal texts, for example product descriptions.