Hello WeeverApps.

The look of charts greatly depends on the chart engine and the type of chart you're using. In the attachments I have chosen Google charts - Area chart, and it still allows you to change the color. I don't know which chart you are trying to use, but if it's not in the "Series" menu, then you might need some custom solution to implement it. You can check in our documentation about wpDataCharts callbacks. 

• Every chart exposes several options that customize its look and feel. Charts usually support custom options appropriate to that visualization. wpdatachart callbacks  allows adding options that are available in Google Charts API, Highcharts API and Chart.js API. 

• All necessary resource are available in charts engines API (depends on which one you use). Every engine has different approach of charts settings. In wpdatachart callbacks you have to adopt those settings to wpdatachart object(you can take a look an example for each engine in our documentation and also in Support help center). Huge number of examples for any area of programming you can find on stackoverflow.com(typing your problem in google and of the end add site:stackoverflow.com and google will search only on that website) and also a lot of resource of examples of chart, chart settings and customization you can find on jsffidle. net(typing in google for example line chart highcharts jsffidle)
• Please note that using hooks or wpdatatable and wpdatachart callbacks requires certain level of programming skills and included support refers only to advises.

Best regards.