Hi, and thanks for your interest!
It sounds like you are working in a Autodesk Forma project, but the tutorial you came across covered the functionality from Classic projects. Autodesk Forma project beta gives the most accurate preview of the future of our product. We realize the two project types might be confusing, and should be making it even more clear what project type the learning material refers to.
I confirm that the Explore functionality is not supported in Autodesk Forma projects. With Autodesk Forma, we are rebuilding our product on a new foundation that we are confident will - over time - make it far better in terms of customizability and interoperability with other design tools. However, we have not yet gotten to the point of building generative features in Autodesk Forma to solve the same problems that Explore solves in Classic. Doing so is high on our list, but making sure we do it well takes a bit of time.
We are currently focusing on the Line Building functionality, which is planned to serve as the foundation for generative features in the near future. While Line Buildings on their own is not a generative feature, they do combine very quick and easy drawing with customization (e.g. in manually drawing floor plans) that far exceeds their counterpart in Classic projects. If you find it worth your time to test out designing with Line Buildings, we would love your feedback! We think the way to make great generative features in Autodesk Forma will be by first making Line Buildings work really well. User feedback is invaluable to us in this effort!
I know this doesn’t really help you in getting generated suggestions for your site now but I thought I would give you more visibility into the direction we are taking. I hope you will still find it interesting to try Autodesk Forma projects. It would be great to hear your thoughts as we continue improving it over the weeks and months to come.
Regards,
Espen
Note: this post was revised after the rebranding from Spacemaker Next-gen to Autodesk Forma