I frequently loose count and focus of layout objects differing from the currently chosen theme. This often happens when copying objects from one layout to another or from one file to another.
I would like to have an opportunity to show / identify these things. The red arrow already established in the inspector could be used as a tag.
So another entry in the menu "View" - "Show" -.... could maybe solve my problem as for setting a mark on conditional formatting or Quicksearch.