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.
Most routers have a "Connected Devices" or "DHCP Client List" section. If you see a device you don't recognize (like "Linda’s iPhone"), that’s your intruder.
How to Hide Your Internet History from WiFi Owners - Top10VPN Your Bitch Neighbour
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.
Often, people leave their router's admin login as "admin/admin." Change this so the neighbor cannot log into your router settings to find your new Wi-Fi password. This is the most effective "reset
Ensure the websites you visit have the padlock icon in the browser bar.
Most modern websites and apps (like Reddit, Netflix, or Banking apps) use HTTPS encryption. The neighbor can see that you are on Reddit, but they cannot see specific pages, posts, or passwords. If you see a device you don't recognize
If your computer has "File and Printer Sharing" turned on, they might be able to see and access folders you’ve marked as shared. How to get them off your network