It is quite easy to change the typography of the Read More Tag if you have the Zakra Pro Add-On. To do so, just follow these steps:

From your WordPress Dashboard, navigate to Appearance > Customize > Theme Options > Typography > Blog/Archive Post Title.
Under the Read More options, fill in preferred details in the Font Family, Variant, Font Size, and Line Height fields.
Click on Publish

It is shown in the image below:

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