https://www.ifixit.com/Answers/View/912274/Wifi+button+is+bot+showing+up+in+control+center..
I don't have internet on my laptop, the wifi button just disappeared on control center - HP EliteBook 840 G7
wifi buttoncontrol centerbotshowinghp
https://www.olimex.com/forum/index.php?topic=7050.0;prev_next=next
MOD-WIFI-ESP8266(REV.B) and the button
modwifirevb