In most games Inventories have limitations, such as space or stack size, etc… By default ItemCollections have no limitations in the Inventory System. You are . . .
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One of the restrictions allows you to specify how many stacks you are allowed to have in a item collection.
You can also use the DynamicInventorySize component:
The Dynamic Inventory Size component is used to dynamically restrict how many items can be carried in the Inventory. Check out the feature scene “Dynamic . . .