Where is Master/Detail option in Page proprieties ver 8.5.9

Hi
I’ve installed Radsystems ver 8.5.9 and tried to make master / detail form.
(Like this tutorial : How to Configure Master Detailed Form | RadSystems Studio | Low Code)
https://www.youtube.com/watch?v=uMt46SVYee4&t=140s
But I can’t find Master/Detail option in Page proprieties?
Would you please update this tutorials.

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