Hi @Angelina Selitskaya ,
AFAIK currently the expandable rows view is not supported in the dashboard view. Adding a screenshot below for illustration of the same.
So I would recommend you to raise this requirement as a feature request in this feedback forum. In general, Azure feature or product team would check feasibility of a feature request, triage it, prioritize against existing feature backlog, add in roadmap as appropriate and would announce and/or update the related Azure document once a feature request is addressed.