WiFi Management

You will always see those connections. If you installed software that came with that adapter, it can override built in Network Management for Wifi built into Windows. Double check this and uninstall any software that came with that adapter, you do not need it, just the drivers. Without the proper credentials for that SSID, you would not be able to connect. Double check that your network is set to private, along with double check the following.

1. Launch the “Settings” app from the Start Menu.
2. Click on “Network & Internet” and then choose the “Wi-Fi” option from the menu on the left.
3. Proceed to click on “Manage known networks” link and from the list select the network you don’t want to automatically connect to.
4. Right click on the connection and click on “Properties”.
5. Now simply look for the “Connect automatically when in range” option and set it “Off”.
6. Another way around is to click “Change Adapter Settings” when you’ve clicked the “Wi-Fi” option and change the auto connection settings by changing the wireless properties of the desired network.

I wrote a blog post back in 2017 about how to clean up old network profiles using the netsh commands. You'd have to run the netsh wlan show profiles command, capture and parse those results, then use them to issue necessary netsh wlan delete profile name="<string>" commands to get rid of the ones you don't want. This could indeed be automated, but would take some programming effort. I'm not aware of any such tool, but I'd like one of them too, if you find one.

That blog post resides at Clean Up Old Wireless Profiles in Windows 10 - Windows Enterprise Desktop.

HTH,
--Ed--

PS: the logic I'd use is to set the profiles I wanted to keep, then to issue delete commands for all that don't match the contents of the keep list. As a programming task, that's pretty simple:
1. get profiles
2. for all entries in profile list
delete entry if-not-equal-to keeplist