Default sizing for some of the 'Create Relational child...' dialogs hides some parameters. Looks like resizing of the dialog also needs some tweaking.
I am attaching an example for New Child > Procedure... in virtual relational models. On my system, the Name in Source is fully covered. IMO, the bottom tabbed panel should be in a scrollable panel and items above it should never be hidden. Resizing smaller would then result in scrollable area at the bottom with everything accessible.