Cannot find "files changed" in pull request

I am taking one of the GitHub courses, on pull requests, and it keeps giving me the instruction "On the pull request, click Files changed." I cannot find any link or button with this caption! Please help.

Hi there, see the screenshot from the Atom repository. The button is right there. The URL it leads to looks like this:

https://github.com/atom/atom/pull/18678/files

or

https://github.com/<user>/<repo>/pull/<PR number>/files
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