Green Highlighting of Action-Targeted Components is Not Cleared When Action is Seleted
When an action is selected in the Events panel, a green highlight shows the targeted component.
If the selected action is deleted, the highlight is left behind, even if other actions are selected. These two rectangles are "phantom" highlights from a couple of deleted actions:
The "phantom" highlights even appear on other screens in the same prototype, and do not go away until the prototype is [saved, if necessary,] closed and re-opened.