Yes, as Ferimer says, cellular 5G operates anywhere from 24.25 GHz to 52.6 GHz frequency.
The moniker "5G" along with it's predecessors "4G/LTE, 3G, 2G, 1G, and EDGE" are all just marketing terms to help the end user understand in the the simplest of ways that the higher number just means better speeds.
The "G" in "5G" on WiFi routers is just shortened from "GHz" which is the frequency at which the WiFi chip operates, this also means that it is capable of faster speeds over wireless, but at a shorter range (meaning you can't go as far away from the source as you can with 2.4GHz, and it travels less easily through solid objects like walls)
These connections that we give names to are just radios operating at certain radio frequencies and sending out radio signals (just like your local radio stations and satellites) but as also stated, depending on the circumstances and the scenarios, certain radio frequencies (not all) can have negative effects on certain people in certain ways.
But yeah, not the same thing as 5G cellular.
And to finalize things: clicking that virtual switch button next to the WiFi option as shown in the picture is turning it off not just hiding the name. So you are good there. Just flip those virtual switches to turn either WiFi frequency on and off on your router whenever you please to your hearts content.
To clarify, the little check mark box on the bottom picture that says "hide broadcast" is the option that just stops broadcasting the WiFi name for other devices to see it, but where it is still turned on and active.
I hope you have the information you need now and that your problems have been solved in regards to this WiFi question.
If you ever need information in regards to other tech issues please feel free to ask in the forums by creating a new thread under the proper category
(we also have some categories for non tech related things if interested in using those parts of the forum as well)
As for me, I use wireless earbuds that use bluetooth in my ears like 18 hours a day, and bluetooth operates at 2.4GHz frequency, and I have that in my earhole right next to my brain XD and if it ends up killing me then so be it lol, I need that wireless in my life.
(cue the introduction/revival/return of the "bluetooth causes brain cancer" scare from back in the day)