is there any way in teams admin center or work around thorough SharePoint to change standard channel to a private channel in MS teams ?
Change standard channel to a private channel in MS teams
@Almothana-Alhamoud , I hope all is well. Currently there IS NOT a formal, supported and documented way to do this directly within Teams and/or the Teams Admin Center, according to Microsoft.
The ONLY currently supported mechanism is to delete the Public Team and recreate it as a Private Team, which is not a great solution, but what is available as of now.
UNOFFICIALY, there are 2 methods you can use... ( I DO NOT RECCOMEND #1 or #2, just simply informing you about options that exist !!!)
The first involves using SharePoint to modify permissions on the underlying document library that backs the Team:
View the MS Team in SharePoint.
In advanced sharing properties click "Stop Inheriting Permissions" on the parent folder of the desired Team.
Delete all listed users then re-add users you want directly.
Global administrators cannot be excluded and will show as "yourdomain" Owners.
Second would be to use a third party product such as AGAT software's channel manager for Microsoft Teams:
Good Luck !!!