Remove users from channel groups

Is there a way to remove users that are assigned to channel groups?

I can delete them when they are connected, but not when they are not connected.

Are you talking about the TeamSpeak 5 or TeamSpeak 3 Client?

TeamSpeak 3
goto Permissions and select Channel Groups and then the group

or take a look at this guide How to remove a user from Channel Groups? - TeamSpeak

Go to Channel Groups of Client:

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Here you’ll need to enter the clients unique ID:
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You’ll find the ID in the List of All Clients. Just copy it from there and enter it in the menu above.
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