Apparently you have stumbled upon the Kanji Study fan group
6000+ kanji it says somewhere.
You can order them by sets to study. Some built in ones are Japanese school grade, JLPT level, Jouyou, Remembering the kanji and Kanji learner’s course. They all have an ‘other’ category that contains the kanji that aren’t included in that set. For example, if you study by JLPT level, the ‘other’ category contains 20 groups of 200 kanji each next to all the N5-N1 kanji. You can make custom sets, I use it to study them by wanikani level. So it’s always the same kanji, but the order you study them in/the way they are presented is by these sets.
I’ve thought about asking to add a wanikani set now that it is public information which kanji belongs to which level (as far as I know).