Is it possible to add an option to custom study only kanjis you've reached Sensei level on? Similar to WaniKani that has an option to study all your Burned kanji randomly. Also, as a follow up, what exactly reaching Sensei means? Do they still come back to reviews after some time?

There are a lot of Kanji I haven't seen for a while, guessing they are all at sensei level. Would like to be able to see them to verify I recall what they are.