Suspicious/Unknown devices connecting to my network. How to DISCONNECT or BLOCK them?

I checked the App and website as well as Google and the only "solution" is to go INTO SAID DEVICE's settings and disconnect it manually. But I don't have access to that because I obviously don't recognize the devices. And there's like 40+ of them!!

• Is there a setting that I can do from MY Xfinity App or Account to disconnect any devices that I don't recognize?

Yes, I already changed my password twice. But why isn't there an option to tell my account that this is a device that I don't recognize and I don't want to allow it to connect to my home network?

It keeps telling me so cheekily "Let's create a profile for Carter!". Who th is Carter???

The only "workaround" that I came up with is to create a Profile and named it "Unknown". And I have to assign each device that I don't recognize to this "person" and pause them. Now I have about 30+ devices there. That's how many I keep getting notifications for saying "A new device connected to your network".

There must be a way to tell my account when it's a device I do NOT recognize and are not to be trusted. Or that I don't want to allow them to connect. Not today, and not ever. Don't suggest a profile to me. I want to block them or at least disconnect them instantly.

I looked everywhere but there is no helpful info whatsoever. If anyone knows of a good permanent solution, please advise.

UPDATE: I was recommended the "Forget Decive" option. But That DOESN'T Help At All!!

When I click on the device, the only option it gives me is "Assign to a person/profile". I have to click on Device Details to finally find that it's the very last option is Forget Device.

However, I didn't use this the first time because I'm worried that "Forget Device" would only disconnect them for the time being and that they can simply keep coming back and reconnecting. Which was CONFIRMED TO BE THE CASE. So this option is basically USELESS or at least doesn't solve my issue.

• Is there a setting that I can use to make it so I can manually approve new devices connecting? That would be way even more ideal.
  • If it's a device that I already assigned to the household, then yes, please let it auto-connect.
  • But if it's a whole new device, then please prompt me to manually allow or deny the connection.

If it's a guest that I know, I would like the option to allow them manually.

If it's someone I don't recognize, then I would like to deny the connection before it even happens.

Is there such a thing?