A/B Test Changes option disabled

EPiServer 10.5

I didn't find many developer resources regarding the package Episerver.Marketing.Testing but when I installed on an Alloy-site I had A/B testing working there. Though when I installed the same package on the site I'm working on, the A/B test changes option is disabled. What could cause that?

Alloy: https://goo.gl/photos/PkQ3f69chDy82qra6

My site: https://goo.gl/photos/jwDFXe1GFWprsYGp8