Lessons are still ordered (but now with old and new options)

First your lessons are sorted by level, with lower levels coming first. Then within each level, they are sorted by lesson type, with radicals followed by kanji followed by vocab. This is the new default.

Only if what I described is something you don’t want. You can have it jumble after the ascending level sort, or you can just jumble everything like it used to always be.

You can reorder lessons and reviews with much more precision using this.