Before adding a channel to your team, make sure you are a 'Team Owner'.
To add a public channel:
1. Go to the 'Teams' tab on the left sidebar located on the left side of the screen.
2. Click on the three dots located besides the team name that you want to create a New Channel for.
3. Click on 'Add Channel'.
4. On the pop-up window, add the channel name and channel description.
5. Make sure that the privacy tab is set to 'Standard'.
6. Click Add.
7. The new public channel will appear under the team's name.
To add a private channel:
1. Go to the 'Teams' tab on the left sidebar located on the left side of the screen.
2. Click on the three dots located besides the team name that you want to create a New Channel for.
3. Click on 'Add Channel'.
4. On the pop-up window, add the channel name and channel description.
5. Make sure that the privacy tab is set to 'Private'.
6. Click Add.
7. You may choose to add team members at this point since only the members in the group will be able to see it.
8. To add a team member start typing his/her name in the search bar and then click 'add'.
9. Once you finish adding all the team members, click on 'Done'.
10. The new private channel will appear under the team's name.
The lock on the right side of it shows it is a private channel.
Show and Hide Channels
Show and hide channels in Microsoft Teams to keep up with important channels and hide the ones you don't need.
Hide or show a channel
From within the channel, Select More options
> Hide.If you want to unhide the channel, select hidden channels > Show.
Customize channel notifications
Select More options
> Channel notifications.Choose the settings you want such as new post notifications or channel mentions.
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Select Save.
Notifications appear based on your preferred settings.