Where do you find this? You can enable a job and wait for it to start or you can right-click on the job and select Run, but this was also avaible in version 14?
But you are right. The "Run" option in the context menu is only visible if the window is opened via "Tools | DBMS Scheduler" or the toolbar.
But not if a job was selected from the object tree and the DBMS Scheduler window is opened via the "View" context menu.
So my joy is limited again
By the way, this already worked in v14. But I had never tried that before.