You can't directly make a Teams channel private after it's been created. However, you can achieve a similar outcome by adjusting the channel's membership permissions.
Here's how:
- Go to the channel you want to make private.
- Click on the three dots (...) next to the channel name.
- Select "Manage channel".
- Click on the "Members" tab.
- Click on "Add members" and choose the specific individuals or groups you want to allow access.
- Remove any existing members who should not have access.
By following these steps, you effectively restrict access to the channel, making it private to the chosen members.
Important Note: This method doesn't completely prevent anyone else from seeing the channel's name in the team list. However, it will prevent unauthorized access to the channel's content and discussions.