After creating your header, you can assign it only to a specific page or pages:
Note: Post Options section will appear on the page backend only after you install the plugin Advanced Custom Fields PRO. It’s bundled with Jupiter X and can be installed via Jupiter X > Control Panel > Plugins as described in this article.
1. From the WordPress left menu, go to Pages and enter the page where you wish to assign your header to.
2. From the Page Options, click on Header.
3. As Type, select Custom and below that select your header Template.
4. Publish or Update the page.
Note: You can use Default Header but it has limited settings and styles rather than the header that you create with Elementor.