I want to change the colors of 2 measures manually using expression.
Dim1 : MonthYear
If want to give colors to measures of my own choice which are not present in the default color list.
For an instance--->
Sum(Sales) : Liight grey
Sum(Discount) : Lime Yellow
I could you Valuelist function, but it needs one more dimension. Unfortunately Combo chart has only dimension.
If you want to alter the look and feel of standard Qlik Sense objects you need to alter the json theme file feeding the css of sense.
Into something like this:
Take a look at this forum thread for more details: Re: Access to CSS