You can have the Sticky Header feature for your site with the Zakra Pro Add-On.

Navigate to Appearance > Customize > Header > Sticky Header from your WordPress Dashboard.
Toggle on the Enable sticky header option.
Click on Publish.

It is shown in the image below.

If you want to make a sticky header for specific pages. Refer to this article: How to enable Sticky Header for a specific page? (Pro)
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