Doesn't your network have an identifiable name like "Rita's network" or one with the name of your ISP and your unique router ID?

You should be able to find it in the dropdown and see whether it offers you 2.4GHz and 5GHz as options, but since you say that you don't see a way to pick GHz's I guess your router is like mine and bounces back and forth on its own volition.

There's just something wrong with having to disable one functionality to correct another. You don't need Bluetooth, but that's hardly a given.

(I don't remember if this ever came up before, but have you ever tried to connect to your router by entering http://192.168.1.1 in a browser address field?)

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire