I got a pull request assigned for review that I was not working on

I got a pull request assigned for review that I was not working on?

Why is that? and how can I disable it?

GitHub reviews assignment policy

For every pull request opened in a repository, GitHub automatically picks a reviewer with the Maintain permission.

Normally that is picked by a round robin approach through the GitHub team API.

You can exclude yourself by browsing to the team e.g.

https://github.com/orgs/avnet-embedded/teams/<team name>/edit/review_assignment

and select your username under Never assign certain team members and the drop-down list below.