Answered
How to delete Custom Page Sizes / Document Preset sizes
In the Pages panel I've edited the Page Sizes. These custom page sizes have been saved. And also appear in the New Document Preset sizes.
How do I delete these?

In the Pages panel I've edited the Page Sizes. These custom page sizes have been saved. And also appear in the New Document Preset sizes.
How do I delete these?

Hold, I've just worked it out...
In the Page Panel > Edit Page Size > Custom > Select the size and delete it.
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