Question on global reports, milestone gantt

Question on global reports, milestone gantt

Hi all, I have a question regarding the "global reports" section.

In our setup we have many projects running, and when our CEO looks to the global reports section, using the milestone gantt, and filters for "task owner" or something else, what he reaches is a view in which all the milestones are present, not only the ones that have a "visible" task.

I think that this could be an user's choice, to decide to have those milestones visible or not, but I cannot find a way to do so. Is there a way to filter out milestones that - resulting to the filters used in that moment - don't have a task shown?

Thanks a lot
Andrea