When you access your course team (MS Teams site of your course), you will see the course team channels (under the team name) and the main channels (under Main Channels).

Some channels might be hidden from your view and you can change the visibility of these channels for easy access.

Click on the Hidden channels

Click on the three-dot (More options) on the channel you want to be visible for your view.

Select the Show option.

You can also check the visibility of all channels at the same time.

Click on the three-dot (More options) next to the team's name.

Select the Manage team option.

Click on the Channels tab.

Check the check box of the channels you want to show.

Note: You can hide any channel that you do not want see its updates (i.e. new posts and/or replies).