After filtering inventory navigate to the Layers & Display Options tab. Under Display Options, use the selector to the right of Show Unselected Inventory. Apply View.
TIP: Nothing will change until the view has been applied.
When this option is selected, the map shows all inventory, selected units and unselected (greyed-out) units.
When this option is not selected, the map will show units based on what is selected in the Inventory Summary List, located on the right side of the map. Use the Select dropdown to manage selections.
None, shown below.
All, shown below.