[XTemos] Elements >> Product categories >> Data source
It is recommended to add the “By Parent” option to the Data source.
Same as the Product Categories element that comes with elementor.
Sorry to say there is no option in theme settings to add “by parent” option in the data source. Try to choose data source “Custom Query” and choose the categories as per your need. https://ibb.co/Q6RxWff
Sorry to say but right now there is no option in Theme Settings available for that. It requires Customization and this is beyond our limitations and support policy scope.