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When working with the ArcMap layer symbology methods for charts (Pie charts, Bar/Column charts, or Stacked Charts), there is an option to "Prevent chart overlap". This prevents the charts from being placed on top of each other on the map.
When symbolizing several layers with charts, it is possible that some charts will overlap.
The "Do not overlap" checkbox for charts only works to resolve placement conflicts between charts within one layer. Charts from the current layer may overlap with charts in other layers.
There are two suggested solutions, choose one of the following: