That is a great question you posted about the SMH(Smart Home Manger). We have found this article:Smart Home Manager
It does state that you can remove devices from the Wi-Fi, but if you are unable to find that feature, you may not have the gateway that you need to do it. The only other option is to turn off the device that you wanting to disconnect from the Wi-Fi and it will disconnect by itself.
If you need any thing else, we are always here to help.
Matthew, AT&T Community Specialist
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