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It's easy to set different category as "June" and "April,May" as color, but one thing.
Because you have two data source, below calculated filed needs to be added on secondary data source.
if month([Date])=6 then "June"
elseif month([Date])=5 or month([Date])=4 then "April, May"
Then, put this category from secondary data source into VIZ.
Then, change the color as you like.
Thank you Shinichiro for your detailed reply!
You are welcome.
And could you mark my answer as "correct"?