Googling "matplotlib rcParams" brings up the following page: https://matplotlib.org/users/customizing.html

I think this page may be an orphan. I can't figure out how to navigate to it from the https://matplotlib.org/ homepage. And does not seem integrated into the sphinx toc flow. For example if I press "next" in the navbar, and then "previous", I don't get back to it.

It also is apparently outdated. For example, it is missing the legend.title_fontsize parameter that was added in 3.0. And you'll note that it doesn't have "Version 3.1.1" in the title section the way that other pages in the current docs do.