Render Dialog as route retaining the rendered route

[aswinsekar]

I need help in approaching this case.

App/
├- Route1
├- Route2
Settings(In Dialog)/
├- Settings_page1
├- Settings_page2

The App route will be rendered always. The settings route should be rendered on top of the App route and the app route shouldn't be changed, as closing the dialog should come back to the old route state.