Originally Posted by
Magnimost
Oh I see, thanks! That's a peculiar design choice - the same confusion is with skills and abilities which can't be edited on the combat tab, but can on the main tab.
Therefore follow-up bug report: the dark shading of Attributes, Skills and Consumables on the character sheet suggest they can be changed on the main tab, but the latter can't. Consumables should be lighter shade of gray on the main tab. They are correctly shaded darker on Combat and Inventory tab.
Also, Air consumable increases when the item is picked up in the UI. It should increase only when equipped.