There is an option to toggle this feature in your BIOS (aka "Setup Utility").
For more information, see your notebook's Getting Started Guide.
On page 22, under "Using the keyboard/Using the Action Keys":
Action keys are customized actions that are assigned to specific keys
at the top of the keyboard. The icons on the f1 through f4 and f6
through f12 keys represent the action key functions. To use an action
key, press and hold this key to activate the assigned function.
Under that description is a "Note":
The action key feature is enabled at the factory. You can disable this feature in Setup Utility.
If this feature is disabled in Setup Utility, you must press
fn and an action key to activate the assigned function.
Additionally, according to your notebook's Reference Guide:
To start Setup Utility (BIOS), follow these steps:
- Turn on or restart the computer, and then press
esc while the “Press the ESC key for Startup Menu” message is displayed at the
bottom of the screen.
f10 to enter Setup Utility (BIOS).