On the Roadmap, why are green markers (seemingly indicating end dates of planning levels) sometimes displayed and othertimes not shown?
Even if a project has an end date assigned to it, a Portfolio Item must exist in the Project in order for the Project End date green line to show...
When filtering by the Timeline UI, the selected values must be assigned to at least one Portfolio Item in a specific project in order for the project end date green line to show.
There is no way to configure the green lines to show in all cases. If the projects does not have an end date, the Timeline would be driven by the Planned End dates assigned to the Portfolio Items.