ChartDisplaySettingsEventArgs

 using cAlgo.API;
 namespace cAlgo
 {
     // This example shows how to use the Chart ChartDisplaySettingsEventArgs
     [Indicator(IsOverlay = true, TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
     public class ChartDisplaySettingsEventArgsSample : Indicator
     {
         protected override void Initialize()
         {
             Chart.DisplaySettingsChanged += Chart_DisplaySettingsChanged;
         }
         private void Chart_DisplaySettingsChanged(ChartDisplaySettingsEventArgs obj)
         {
             Print("Chart {0} {1} Display settings changed", obj.Chart.SymbolName, obj.Chart.TimeFrame);
         }
         public override void Calculate(int index)
         {
         }
     }
 }

 import clr
 clr.AddReference("cAlgo.API")
 from cAlgo.API import *
 class Test():    
     def initialize(self):
         api.Chart.DisplaySettingsChanged += self.on_chart_display_settings_changed
     def on_chart_display_settings_changed(self, args):
         print(f"Chart {args.Chart.SymbolName} {args.Chart.TimeFrame} Display settings changed")