Disable Primary Header ON ALL PAGES BUT ONE

Dear all,

I have created a wordpress website with Astra Theme. I created about 150 subpages.

I know how to disable the primary header on a single page. But how do I disable the primary header on all 150 subpages in one step? (I only want to see it on the front page, so I cannot delete it).

Thanks in advance.

The page I need help with: [log in to see the link]