In this case, pressing and holding the Fn key while simultaneously pressing the desired function key will activate the secondary function. Some laptops have three functions and an Fn1 and Fn2 keys.

Alternately, pressing both the Fn + F1 keys puts the computer to sleep as printed on the key. Restart the computer. On modern Dell laptops, you need to turn off Fn lock key by clicking Advanced ...

The Dell XPS 16 is available now ... etc, when you press the Function key. You can flip this to have the function keys as default by pressing Function and Escape, but then you have to press ...