So heres where the things get ugly :)
At top of the window there is [Character's Statistics Panel], this is base for further calculations.
Row below there is:
1. radio button (round checkbox) - indicates whether you want to display [Item Panel]s and [Weapon Set Panel]s vertically or horizontally,
2. "Calculate" button - results won't get updated without clicking it,
Then there is [Equipment Sets Comparer Panel] consisted of [Item Slots Chooser] and +/- 4 [Equipment Set]s
Wiki: Character's Statistics Panel
Wiki: Character's Statistics
Wiki: Equipment Set
Wiki: Equipment Sets Comparer Panel
Wiki: Item Panel
Wiki: Item Slots Chooser
Wiki: Naked Character's Statistics
Wiki: New Character's Statistics
Wiki: Weapon Set Panel
Wiki: Weapon Set