When learning new words in a group and you have words to review in that group you do 5 new words and review 5, but if you don’t have words to review in that group (e.g. 1000 most common) but have in another group (e.g. 500 most common) you don’t review the words from the other group. It would be nice to learn new words from one group e.g. 1000 most common while reviewing words from another group e.g. 500 most common.
This suggestion was sent by @Marcos in the Discord Server.