How to create free shapes in TinkerCAD?

I bought a 3D-printer (I love it!!) and now I'm creating 3D-designs with Tinkercad. I'm (obviously) a beginner and I'm now trying to create the bow of a little boat for which I have a specific shape in mind. I found this tutorial on how to create a custom shaped vase with tinkercad but I don't see the interface elements it shows in the screenshot they show (pasted below).

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In this other tutorial they use a "Shape Generator". I found the heading "Shape Generators" in Tinkercad but it doesn't look at all like what I see in the screenshot of the tutorial (pasted below).

Does anybody know how I can access these interfaces in tinkercad? All tips are welcome!


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