How to add Entities as a panel_iframe?

I’ve created a panel_iframe for the Entities registry page, but it’s nesting the side menu in the panel (see screen shot). I want it to just display the Entities page without the sidebar. Can this be done?

Here is my yaml:

panel_iframe: 
  entities:
    title: 'Entities'
    url: '/config/entity_registry'
    icon: mdi:format-list-bulleted

Here is what it’s doing: