Question: wireless keyboard volume functions don't work
I purchased a wireless keyboard with the numeric keypad. The volume functions on the keyboard do not work. When I hit the volume down button it hides any screens I have open. My old wireless keyboard volume functions worked.
When I go into system preferences I do not have this option
Select "Use all F1, F2, etc. keys as standard function keys"
My old keyboard did not require me to set this up. Do I have a defective keyboard that Apple needs to replace?
iMac, OS X El Capitan (10.11.6)