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Tableau always adds the null to the Quick Filter when filtering a dimension from a secondary source.
In your case, what you're looking for is two separate filters on the same data source. The easiest way to do that is to have two worksheets and put them on a dashboard.
Thanks Jonathan for your reply,
I have also thought of this and even applied too. But what I want is the same axis for both the graphs.
I have tried with dual axis and synch one but No luck as mentioned above.
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