inventory/inventory_overlay/InventoryOverlay.gd

@@ -180,10 +180,12 @@ func _gui_input(event: InputEvent) -> void:
 	if not _is_visible:
 		return
 
-	if event is InputEventMouseButton:
+    if event is InputEventMouseButton:
 		if event.button_index == 1 and event.pressed:
 			if not _is_dragging:
-				pass
+				hide_overlay()
+				close_requested.emit()
+				return
 		elif event.button_index == 1 and not event.pressed:
 			if _is_dragging:
 				if _hovered_slot == null: