Battlefield V Gamepack Problem

[J2Kbr]

I was looking at the device configuration screen, what does the ffb on ports do?

Here you can enable or disable the FFB (rumble/vibration) on the controller plugged on each specific port. This is desired, for example, when having a controller at Input-B just for console authentication purposes (you don't want the controller vibrate while resting on the table).

And right below that theres device options, with 4 settings, how should I set this all up to be optimized for use with a xim apex?

For XIM/Apex, set the output polling rate to 1000Hz. All the other options will not have effect on the performance with XIM, so you can leave at the default values.