
Hello Peter,
So there are two types of pages. The first includes two holders: Page Content and Website Content. As you may know, objects that were put to Page Content can be visible on the current page only. And the objects that were put to Website Content can be visible on all the pages.
As for second type of pages so there is one holder added except previous ones - Page Layout Content. The objects that were put to this holder can be visible on pages of this type only.
Best regards,
Sam Clayton