I cannot figure out how to attach an image. in the now playing block to the far left should be your album art, shuffle key and then repeat key. Toggle the repeat key until it turns blue. That will repeat all, another toggle should be blue with a 1 on it, that is repeat a single song. Gray is no repeat.
It's missing for me as well. You can toggle repeat from the Control menu and then the repeat button will appear next to the shuffle button. It seems to disappear if you turn off repeat and change to a different application.