I have created a dummy dimension and used it in a bar chart.
Now when I hover my mouse on the bar chart..it shows dummy as the lable in it. I don't want the name dummy to appear there.
can I sort this out?
That's not possible yet afaik. You could try giving the dimension a name that at least makes sense in the popup. Perhaps Category or Channel. I don't know what kind of thing the names of your expressions represent.
Somewhere you can the dimension the name 'dummy'. Qlik Sense doesn't generate that kind of name itself. You specified that somewhere. That's also where you can change it.