Remove Repetitive Names from Charts while using "add Series"

I am trying to join two bar graphs in dashboard in a single chart for easier comparison. But since the column names are similar, it is showing two times in the chart header just like below image and is annoying.

The entire chart looks like this:


How can I keep just one set of data and remove the repetitive ones??

Hi @brucewayne_now
You would have to make a single question where you join the two questions and summarize them into a single result.

I need to see different month data like this. That's why I used "Add series" , but if join both questions, I don't get the desired output.