Setting Widget Style - Divider Line

My client built out several dashboards and one of them has divider lines between the top KPI widgets. I found this Sisense article to turn those dividers off - https://documentation.sisense.com/docs/setting-widget-style#divider-line. 

I cannot follow the same instructions because I do not see the same design options on the right hand side when I open up the widget in question. 

This widget is built using BloX - I wonder if that is a part of the problem. This entire dashboard is embedded to another website. 

Any suggestions?