Issue with copying master pages
I'm using InDesign 2025 on a PC.
I'm trying to create a photo book in one of the Blurb templates. I've done several of these, and every one uses the same master pages. I've created a grey background that I use throughout the Blurb book.
I googled how to copy the master pages from a source document to a new one, and every time I go into Layout-Pages, the ability to Load Pages is either grayed out, or not showing up at all. I have done this before but forgot how to do it. The more I google, the more confused I am getting.
Can anyone give me simple instructions as to how to do it, please? I must be highlighting something incorrectly. Thank you.

