Studio 7 - missing hierarchyProperty in Properties of TreeTable

I can’t find the setting in the Designer-Properties for the hierarchyProperty of the tree-Table.
When creating the Screen from scratch there is a property.


But afterwards it is missing.

This is a problem when placing a tree table on an empty screen.
The only possibility is to edit the property in the xml-Text file:

<treeTable id="workTimesTable" width="100%" dataContainer="workTimesDc" hierarchyProperty="parent">

Or am I searching at the wrong place?


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