Is it possible to make Mac forget unwanted wi-fi networks?

I need someone to tell me if this is even possible. When I log into my computer and want to select my wi-fi network, there is a list of about 20 networks available. These are my neighbors' networks and I don't want my computer to even recognize them. I thought I found my answer by clicking on the wi-fi tab, selecting open network preferences, then advanced settings. It allows you to indicate to the computer to forget the networks you have joined in the past, but it doesn't seem to allow the ability to ignore networks that have not been joined, like the neighbors' networks. Do you see my quandary?

As long as they were present and broadcasting an SSID, they will show up in the list. "Forgetting" a network just clears the credentials and tells your machine not to join them automatically.
I don't see your quandary... If you're not set up to connect to those networks automatically, just ignore them. The only way they will go away is if the owner of the network turns off their access point or hides the SSID.

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