In the old version of Projects there was a feature called Reorder Task Lists that lets one change the order in which Task Lists are displayed in the project.  

The new version does not seem to support that feature any more or it was moved somewhere not obvious.  When I click on the ellipsis in the upper-right the only menu option I see is Subtasks Help. 

Is this an oversight for the new version or is that feature no longer going to be supported?