Free camera mode in cockpit

I set flight assist off to R3, which by default is the free camera mode, but im struggling to find free camera mode (Or whatever its called) in the menu to set it to another button, i thought it would be in the headlook menu. Anyone know where it is?
 
Interface mode >(expand section) >headlook > assign button...

There is no free camera on the inside views of the camera suite...
 
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