I am using a macOS, how can I make the F1-F12 function keys default/turn fn LOCK on without having to push the fn key every time/disable multimedia keys on Windows mode?

1. Connect your keyboard via cable and open the Launcher.

2. Select Layer 0 in the Launcher. Remap the top-row keys (their default media key functions) to standard F1, F2, ... F12 keys.

   

3. Switch to Layer 1. Remap the same top-row key positions ( F1-F12) to their original Media Key functions.

 

For a step-by-step tutorial on how to remap keys using the Launcher, please refer to this guide: How to Use Launcher to Program Your Keyboard.