Background colour of pivot table not changing

[ECGCBI]

Hi.
I think that this is an issue, but I am very rookie in using the extension and maybe I do not use it properly.
I am trying to change the colour of the background header of my pivot table to blue, but the extension does not do it. See the image, please. Even if you change the colour, it does not do it. The colour of the text is changed to black, but not the background colour to blue.

I am using QS February 2019 Enterprise version.

Thanks very much.