@xavi.paric , Is it View or analysis ?

If it is analysis, add a text box, fill it with concerned color and expand it all over the screen and right click on it and in the layers option select "send to back" and rest components layers option to "bring to front".

If in view of studio, then you can add white background to each section as below highlighted. Apart from this I haven't seen any customized background color change in views so far.

Thanks! got it :)