Levels no longer available Youtube

I started using LR recently and found it super useful.
One part of that was the way I could set my level (Level 1) and it showed me Youtube videos which were appropriate to that Level. Also I liked being able to see the words which I had learnt or was learning etc. I was away for a couple of weeks and when I came back I could no longer find a way to sort by level. The only sorting option seemed to be by numbers of words that I know but how do I know how many words I know?
Is this a change or have I pressed the wrong button or is it a bug?
Many thanks