I suspect that you have pressed the f(n) key on your keyboard. This F(n) key changes the behavior of the function keys.
You’ll have to press the f(n) key and then try the function key in NV2. For example, press the F1 (which is the help key), if this key press does not position your web browser to a help topic press the F(n) key again and then press F1. again.Some keyboards display a light indicator altering you to function key switch (F(n)) toggled/selected.
Regards to All,