I've added a Custom Page via Website > Content > Add Page
I want to customise the layout of this page but its all locked (apart from being able to turn blocks off and on). I can't delete any grids or add new ones.
On the custom layout page I have a custom menu that I want on the page. I only want the custom menu, not the main menu which is in the header of the custom page.
How do I set a header that is specific only to this custom page?