Neighbour - Your Bitch
They might be able to see the domain names you visit (e.g., google.com ) if they are technically savvy enough to "sniff" traffic, but this requires specialized tools.
This is the most effective "reset." Log into your router’s admin panel and update the WPA2/WPA3 password. This will immediately disconnect every device, including the neighbor. Your Bitch Neighbour
If you are the one connected to their Wi-Fi and are worried about them spying on you: They might be able to see the domain names you visit (e