That means that turning on a cheat like unlimited fungus won't instantly raise your fungus you see to its max. Activating fungus cheat will make this place have its own maximum fungus value all the time it's getting changed. For example your amount of fungus is just a sum and every place where your fungus is stored holds a current and maximum fungus value for this place only. Cheats in this game works a bit different because of how the game works with its values.
