You have just toggled the "Fn Lock." Your F1-F12 keys will now function as standard function keys without needing to hold Fn . To switch back to multimedia mode, simply repeat the process.
Your computer will reboot, and your keyboard will now default to the traditional F1-F12 keys. how to enable function key in dell laptop
There is no "correct" setting—it all depends on how you use your laptop. You have just toggled the "Fn Lock