2.) Why the automatic connection under Windows 10 / 11!
If you did not turn off Auto Connect the first time you connected to a Wi-Fi network, Windows automatically connects your device to that network when it's within range of that network. You can disable automatic connection to a Wi-Fi network while Windows saves the password and you can connect manually. There are several ways to disable automatic connection to a Wi-Fi network in Windows 10, this is the simplest.
(Image-2) Disable automatically connections to WiFi on Windows-10 and 8.1!
If the "Wi-Fi network" adapter does not exist at all , then as I said, the driver for Wi-Fi probably does not exist on your computer. Or it is installed, but it does not work properly.
Check in the Windows 10 Device Manager and see if there is a wireless adapter and if the driver works! Click on the Start menu with the right mouse button and select Options Device Manager! (... see Image-3 Point 1,2,3)
Tip: With some Windows-10 laptops or notebooks there is even a W-LAN switch on the side. You can also use this for a short-term deactivation of the W-LANs / WIFI under Windows-10! This is the so-called aircraft mode for mobile devices!
However, eg with Microsoft Surface PRO press the key combination Windows logo + A and Button Network, check if the airplane mode is activated under Windows-10! (... see Image-4)
(Image-3) Device Manager Wi-Fi Adapter in Windows 10!
When this mode is enabled in the Windows 10 settings, all wireless modules are disabled. In laptops, this is usually Bluetooth and Wi-Fi. Just a mobile network, for example on a tablet. Since it is not difficult to guess from the name, it is mainly intended for flights. Well, it can still be needed on a laptop, but why on the PC! If you want to disable Wi-Fi, simply disable it in Settings or by clicking a separate button in the connection properties.