https://jira.atlassian.com/browse/CONFCLOUD-40793 is the related issue.
It has been open since February 2016.
Using Gantt Chart Planner for Confluence is an option to resolve this problem.
It has flexible timeline features.
Maybe, it's superfluous to install an app to resolve only this problem.
But, the app provides various useful features to draw a roadmap such as WBS, resources, and dependencies so that it may help you in many aspects of drawing roadmaps.
A demo video is here.
There are also some other apps providing roadmap features.
(Disclaimer: I'm one of the folks in the vendor.)
Hi everyone, We’re always looking at how to improve Confluence and customer feedback plays an important role in making sure we're investing in the areas that will bring the most value to the most c...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events