We create a Stacked Histogram like below picture:
We need to Print the diagram with the Legend but there is no option to show the Legend:
In other diagram (not stacked diagram) we can easily see the option to show Legend:
The report will be very hard to understand:
I will show you How to show the Legend in the Printed report.
Click on Print Preview -> Page Setup -> Footer tab. Select to show Gantt Chart Legend.
Now P6 will show the Legend in our report: