By default, most modern Dell keyboards prioritize multimedia actions (e.g., volume up, mute) over traditional F1–F12 commands. To use the legacy F1–F12 functions (e.g., F1 for Help), you must hold the Fn key. However, this can be reversed via Fn Lock.
Here are some tips and tricks to help you get the most out of your Dell keyboard function keys: function key on dell keyboard
Note: Some Dell models (e.g., XPS 13) replace F5–F12 with icons for sleep, airplane mode, or other features. Always check the icons printed on the keycaps. By default, most modern Dell keyboards prioritize multimedia