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To make Header display on all pages you need set it in Theme Options -> Header.
Please note In our theme have a notice that Page Options will override Theme Options. You can understand more about it follow this topic: https://harutheme.com/forums/topic/why-theme-options-doesnt-apply-changes/
That means you need to Edit Homepage (or page have header different settings in Theme Options) then go to Page Options at bottom of page to compare settings with Theme Options.
Hope this helps!