Simply press that key and see if it fixes the problem. You have to use that key along with the Fn key. For example, on my laptop, the camera can be turned on or off by using the Fn + F10 keys.

Keys with an Fn key or F Lock provide two sets of commands for many keys on a keyboard. This includes the top row of standard function keys (F1–F12). In this post, we will show you how PC users ...

Also, on newer MacBooks and Apple keyboards, the Fn icon has been replaced by the Globe icon instead of the Fn key, but don't worry, they both are the same thing.

For example, click the "Lock" icon or press the "F1" key to lock the computer. The laptop displays the selected hotkey card on the screen with the available options listed.