Since a recent update (few weeks ago) you changed visuals of the release roadmap gantt chart. The row height also increased a lot with this update. It adds unnecessary whitespace for us, and the overview is way worse now. Did not find any place where I can adjust that (like at https://big.ideas.aha.io/ideas/APP-I-2086 ?)
Please think about adjusting the layout to a more productive one (e.g. go back to previous layout), or add a configuration option for margins / bar height.