@Virgil Yes, the "parent" page (anywhere in the tree) has Page Title inherit "unchecked" with a custom value or blank value. When you add a child page, it by default "checks" the inherit checkbox requiring the user to uncheck, clear any existing value (to leave blank) or optionally add a custom Page Title.
@Brendan The Global Settings are what I want them to be, in this case I have Settings > Content > Metadata > Page title format = {%pagetitle_orelse_name%} | {%prefix%}. This is what I want, when the Page Title is empty, use the Page Name (followed by the prefix I've defined). Your suggestion seems to say to remove this and set a macro on the parent page or maybe I misunderstood?
What I am looking for is the option to never inherit the "Page title", "Page description" or "Page keywords" from the parent by default while leaving the Global Settings. This would have the effect of a blank "Page title" on every new page which would cause the global rule to use the "Page name" in every case by default.