The formulate module should have a option for "Custom Visualizations". I dont see it, neither in our pyramid analytics platform nor the explore one of the community?
Custom visuals are not activated on the Pyramid servers we host.
However, if you have your own instance, you can toggle this setting yourself if you go to Admin Console -> Profiles -> Select specific profile -> Formulate -> Check "Custom Visuals"
Hope this helps.
Thanks a lot Calvin!