Using shape generator on iPad pro

Hi, I’m new to Tinkercad and slowly learning, so please excuse me if I don’t know the technical terms, if I try to use and of the shape generator shapes that have the ability to change shape, using my Apple Pencil I’ve tried to move the drop down box with the dots and squares, they change to to red nothing moves, I may well be missing something but can’t find the answer as to why this isn’t working as it should.

any help would be appreciated, and in layman’s terms even better, I’m up to date on all iOS etc,


many thanks Janey 


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