Upon clicking State button you are getting to the main status window of your character.
There you can change equipment and weapon worn by your character, rearrange items in inventory and spend the status points obtained from leveling up.
Inventory at right represented with grid of 50 slots. Each item occupies 1 slot. Materials, food, rewards, EXP potions, Memory cards and etc can be stacked to 50 pieces in one slot. This means weapons, equipment and etc can not be stacked and will occupy 1 slot per item.
Furniture can occopy few slots in inventory with various geometry.
There are 4 different additional sections buttons above the main inventory. Three of them are additional inventories which allows to keep various items by type.
Also you may find few additional buttons below:
Servies as expansion to main inventory. Allows to keep any kind of items.
Basic size is 5 slots. Can be expanded to 25 slots by applying same backpacks items from Mall.
Allows to delete any item or furniture from inventory permanently.
Allows to craft equipment from materials. Based on recipie and rank of items. Stats of compounded equipment are random within certain range. Check Compounding guide and forum for more information.
Keeps Mall items which doesn't fit into main inventory. Also system giveaway item will be stored there. You can't put items here, only take.
By putting cursor over any item or equip part you can learn next information: