Instead of creating a spread chart apply the Relative Index Comparison tool to the Agilent chart, along with your indicator. By default it will use the SPX as the relative, but you can change it to your preferred index in the properties. See the video here for more tips on using relative charts:
Of course! Right-click on the RIC line and select Custom colour scheme from under Properties > Plot Style and then enter the script formula, eg RIC() > MA(RIC(), BARS=100, CALC=Close)
OK sorry I misunderstood, but just do exactly the same on the price chart that you did with the RIC (change the RIC back to single colour if required).
It’s impossible to tell from the screenshot but it may be that the bars are too compressed to see the colours. Zoom in to see fewer bars on the screen and see if the colours appear.
If not, click on File > Export Workbook and send the file to support.
One thing I did notice is that the RIC is of the VIX NET NON COMMERCIAL chart which must be hidden from view.