How do I show all levels of hierarchy in the visual roadmap of the Portfolio scope view?

[Marc Tibbitts]

So that it displays Initiatives, Epics and Stories like a Gantt chart.

[Marc Tibbitts]

Gabriele Franck
Atlassian Cloud Support | Jira Software Team

Provides this response to support ticket a colleague created:

You can't set the timeline this way in Portfolio.
You can Group your issues in the timeline by Team, Person, Labels or Components only.
For now, you can see this Grouping in the settings of your plan:

<snip>

image of schedule settings panel from scope view

</snip>

The workaround you can use to be able to set the timeline by issuetype would be creating a label for your issues and then Group your plan by labels.

[Marc Tibbitts]

Correction.  This approach did not work.  Answer should be rejected.