You can hide the key mapping column in DetailsView DataGrid (column maps the parent and nested datagird) of detailsview datagrid by handling AutoGeneratingColumn event.
If SfDataGrid.AutoGenerateRelations property is true, you can fire AutoGeneratingColumn event in SfDataGrid.AutoGeneratingRelations event.
Figure 1: Before hide the key mapping column of detailsviewdatagrid
Figure 2: After hide the key mapping column of detailsviewdatagrid
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