Classic Boards are to be decommissioned, and using the Rapid Boards instead has been recommended since a long time now. However, in Project Overview > Agile, the charts are still based on Classic Boards (based on Versions and Contexts). This is a mixed signal on what we consider to be the major feature for Agile approach; and no quick similar solution is offered to users who want to track progress in the whole Project, not accounting for separate Sprints.

That tab and included charts should be adjusted to use the Rapid Boards settings.