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Planar zone in xact

Hi all
I'm working with one part, which is a disk with three holes and six slots unequally spaced from each other.
I usually use xact, and in the past I have always removed diameter sign and just filled the datums and tolerances in FCF.
But recently I saw that there is a button with the inscription planar zone where i may ajust axis or vector. Now I understand that it is not clear to me how to adjust the FCF in cases of measuring slots (and other things with a rectangular tolerance zone). Do I need to adjust this planar zone in any way in my case?
Maybe someone can tell me a little more about this...i'm use 2014 version.
I've attached a sketch showing what I'm dealing with.