Make a public team private in Microsoft Teams
Private teams can only be joined if the team owner adds someone to them.
Public teams are visible to everyone from the teams gallery and you can join them without getting approval from the team owner.
Change a team's privacy status
You can change the privacy settings for your team from public to private (or vice versa).
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Hover over the team name to select More options .
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Click Manage team and click Settings.
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Expand Team details, then click Edit. A new screen will give you the option to edit the team name, description and privacy.
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In the privacy settings, select the down arrow to choose either Public or Private.
To change a team's privacy settings, go to the desktop or web app.