Change multicolors in bar chart

[reporting_neu]

Hello, how can I change the colors? The colors are specified here but I can't change them. I also cannot choose that I want to take the colors of a finished master dimension.

[anat]

create master dim then choose ur colors

then in color section choose by dimension

[reporting_neu]

Thanks for your answer.
I forgot to say that this is a combo chart.
In a normal bar chart I can select a dimension. But unfortunately not here.

[anat]

Combo chart seems functionality little bit different... Let me check if any possibility