https://www.scrum.org/resources/blog/scrum-guide-2020-update-self-mgt-replaces-self-organization

Consider reading this article from Steven Denning and see how different states of a team contribute to performance. Self-managing is topped by Self-Organising, where teams organise their own context, including team members (self-selection).

And:

Scrum is built upon by the collective intelligence of the people using it. Rather than provide people with detailed instructions, the rules of Scrum guide their relationships and interactions.

https://www.scrum.org/resources/blog/scrum-team-self-managing