You can create a subwindow and still plot objects on the chart itself by specifying the chartID https://www.mql5.com/en/docs/chart_operations/chartid
So you would have to specify the nature of what you want to plot first.
See here https://www.mql5.com/en/docs/chart_operations/chartwindowfind

Documentation on MQL5: Chart Operations / ChartWindowFind
- www.mql5.com
ChartWindowFind - Chart Operations - MQL5 Reference - Reference on algorithmic/automated trading language for MetaTrader 5

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Hello,
is it possible to have 2 type of indicator to be displayed, 1 in main windows and 1 in separate subwindows?
Can someone refer me to an article?
thank you