VIVA background color

Hi,

I'm currently using virtuoso ICADVM18.1-64b.500.10 and I just realized that I can't change the viva background as in previous versions. When I right-clicked on the viva background and the Graph properties(general tab) pop-up,  the option for the background colour is not available. Also, Another way I changed the background was using the command envSetVal("viva.rectGraph" "background" 'string "white"); but now this way is also not working.

Is there a way to change the viva background colour or CADENCE remove this option for the newer versions?

Thanks in advance