If you want to use F1-F12 keys without pressing the Fn key, you can do the following:
If you are windows user:
Windows Fn lock firmware is out now. You can install the firmware from here:https://www.keychron.com/pages/windows-fn-lock-firmware
If you are Mac user:
1) Go to the system settings of mac
2) Select the Keyboard tab
3) Click the option where it mentions "Use F1, F2 keys as standard functioning keys".