Custom roadmaps are a useful tool to show work for multiple teams. One of the most useful features is the ability to show "compact bars" (see screenshot #1), as this minimizes the vertical extent of the roadmap and renders information more digestible.
However, the feature is currently sub-optimal, as items which do not interfere with each other still get placed in different rows (see screenshot #2) - this partially negates the usefulness of custom roadmaps, creating wasted space and exceedingly lengthy roadmaps which are confusing to the audience.
I took the liberty of moving elements around in the page DOM to create a more compact view (screenshot #3), and the results are much more pleasing. I'm able to show related work from 3 separate teams in a very concise view.
It feels like this would be a small modification, likely making the positioning tolerance/padding between report items less "zealous", but it would go a long way in making custom roadmaps more usable! Given that there has not been a lot of attention put on roadmaps/reports lately, I hope you'll consider a small but impactful change.