Debut Collection "Title" vs "Page Title"

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When creating a collection there is a Title field at the top of the page, and under "search engine listing preview" a Page Title field

Can someone help with which gets used where. My site is

I had assumed that the Page Title would appear on the collections page, but apparently not.

As there is no ordering or hierarchy of Collections I was planning on structuring the title as something like "04 Plants > Indoor > Houseplants" with a user visible page title of "Houseplants"

My planned collection list has 77 collections, grouped into 9 departments