Use the group by option to choose how your routemap is organized.
Project lane view
When you use a project lane view, work is grouped by project. This is useful if you need to see when resources are working on projects.
Role lanes view
When you use the roles lane view, work is grouped by role. This is useful if you need to see when each role is working on what projects.
Resource lane view
The resource lane view is similar to the role lane view, but work is grouped by resource.