I have a field that contains various category names, lets say A, B, C, etc... I want to be able to know which categories are in the current data frame view.
How should I go about doing this?
I'm using ArcMap 10.5
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Right-click the layer in the ArcMap Table of Contents and choose Properties. Then click the Symbology tab. Then follow the instructions here: Using Unique values to display categories
This will visually display the data categories in the data frame.