It seems like you want the top row of the keyboard to default to F-keys rather than the function indicated by the icon. You can do that through a System Setting. Specifically, System Setting>Keyboard>Keyboard Shortcuts (button)>Function keys (Sidebar)> ‘Use F1, F2, etc. as standard function keys’(toggle).
Toggling that will now execute the F function on a key. The ‘fn’ key will temporarily toggle the key to the icon function.