Change the Form Font Family change-the-form-font-family
Google Fonts are built into the form editor.
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Go to Marketing Activities.
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Select your form and click Edit Form.
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Under Form Settings, select Settings.
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Select the Font Family you want.
note tip TIP A bunch of Google Fonts are available for use. 
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Click Finish.
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Click Approve and Close.
note NOTE The form must be approved to be used on landing pages. 
note NOTE Remember to approve the landing page draft created by the form changes. 