I am using ArcGIS 10.3 (running advanced aka ArcInfo license) to create a map that has a small locator map at the bottom, so the file has two data frames in it. One of the features (a polygon) in the main data frame also appears in the locator map data frame. When I change the symbology or turn on labels in the feature in either frame, it also changes in the other frame. This is a problem because I need no labels and a smaller line weight for the feature outline in the locator map data frame.
I make maps with multiple data frames containing the same feature frequently and I've never encountered this issue before.
Does anyone know how to fix this?
(I've tried closing down the map and re-opening, but this did not help).