To turn fn key lock off repeat the process you followed to turn it on.
Magic keyboard windows function keys.
Press the right command and or right option key with actual key.
In windows on your mac click in the right side of the taskbar click the boot camp icon then choose boot camp control panel.
F1 opens help in an app or f12 opens the web console in your browser.
Is the menu or applications key on windows that allows you to launch.
The various models such as the magic keyboard.
Select or deselect use all f1 f2 etc.
The right command option keys act like the alt gr key on windows keyboards.
Use function keys on a mac keyboard in windows with boot camp.
Or ctrl key and press d or hold the fn function key down while.
On the following screen ensure that you do not have a check mark in the box that says use f1 f2 etc.
Keys as standard function keys.
In order to type the additional third character symbol on some keys follow these steps.
If your fn keys by default controlled media e g volume playback etc turning on the fn key lock will make it so that the fn keys now execute the secondary function that f1 f12 do e g.
Quick video on how to use an apple keyboard on windows 10 and still use the apple volume function keys.
Click on the apple icon in the top left corner of your screen and then click on system preferences.