To accomplish this, you will want to follow these steps:
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In Joomla navigate to Administrator → Extensions → Templates Manager and select the template you are currently using as your default.
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Navigate to the Fonts settings tab.
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Select Yes in Use Google Font if you want to use google fonts. Otherwise select No.
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If you select Yes in Use Google Font on Google Font Family add the font you want. To get Google fonts names click in this link.
- If you select No in Use Google Font in Font Family select any template fonts from the dropdown.
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Add the Font size you want in px.
- Do the same for the Menu and the rest as h1, h2 etc .
- After finishing this Click Save button
Your site will get the Fonts you selected.