Additional settings-related features and issues within Microsoft Teams Free
If by this, you refer to user's Presence status, then there is no option available in Teams with a personal account (aka. Teams Free) to change the behaviour. Presence status is set automatically based on user's activity.
The options outlined in this support article apply only to Teams with a business account.
https://learn.microsoft.com/en-us/microsoftteams/presence-admins