Hide the pop-up when you add an item to inventory.

This is the Inventory Monitor component, You can hide it simply by disabling the "Inventory Monitor" gameobject.
It's usually located in the "Game Play" panel.

As for showing only certain items, it's not possible right now, but you can create your own Inventory Monitor component by copying the code or inheriting the class and add a filter to only show certain items
 
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