Rank Variations by Move Popularity
When given the option to select which variation in a study to review perhaps the options could be ranked by move popularity and displayed with a rough estimate of how often the move is played. I think there is a database on Lichess of games with an average elo of like 1600? That might be more useful percentages than what the masters play.
It would give some confidence to know that we are focusing on the moves we are most likely to face first and can then come back and study the less common moves.
Agree with OP Paul M (TackyThePenguin). If you could somehow select the elo variations, that would be amazing. Certain moves are extremely popular in specific elo categories and rarely happen in others!
I use openingtree.com for this but agree it should be a nice feature to have in course