Why Aren't Wireless Connections Showing?

Anybody know how to fix this issue?

Screenshot of issue:

https://i.imgur.com/KBNuOPl.png

Here's what I've already checked:

1. Network drivers are updated and working. No issues in device manager.
2. The computer connects via network cable.
3. The computer used to have a private VPN service and even though it's now uninstalled, it was trying to reroute all internet through it.
4. The wireless router is functioning and working. Connecting to the wifi with another laptop works. There are 3 or 4 other network connections that should be showing but aren't.

Thanks in advance for any help or suggestions.

What should I do to resolve this issue?

2. The computer connects via network cable

I've had occasions where unplugging that cable allows the Wireless Routers nearby to show up for connecting to.

Berton said:

2. The computer connects via network cable

I've had occasions where unplugging that cable allows the Wireless Routers nearby to show up for connecting to.

Thanks Berton. Unfortunately they're not showing up when it's unplugged for this machine.

Turns out I'm a big idiot because it was the simplest thing in the world. My mom had flicked the switch on the side to turn off the wifi.

Just another of those things that appear when everything else has been found to be not the problem.