If a grouped layer is contained in another grouped layer in ArcMap 10.3.1, and symbol levels are drawn for the top grouped layer, unchecking the option 'Scale symbols when a reference scale is set' on one of the individual layers removes the data frame's reference scale.
Last Published: August 19, 2020ArcGIS for Desktop
Bug ID Number
November 24, 2015
June 2, 2021
ArcGIS for Desktop
Will Not Be Addressed
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