Provide a way to label extent indicators

Idea created by KKramer-esristaff Employee on Sep 14, 2017

    ***This idea is being logged on behalf of a customer***


    When a layout includes multiple data frames (ArcMap) or multiple maps (ArcGIS Pro) with many of those being used as extent indicators, it can become confusing which extent indicator belongs to which inset map.  


    Distinguishing them by color and/or pattern is significant work, and may not convey the desired reference information that a label could.  Maps having multiple insets can be clear about identifying the insets without the extra work of customizing the symbology of the nameless inset rectangles and their associated dataframe boundaries.