In the mobile versions of the game, which was when this feature was first implemented, after completing both adventure modes, you could replay all levels from both adventure modes (ability to select adventure mode (1 or 2, "1" being the original and "2" being the one where Crazy Dave chooses 3 plants for you), and any level).
This feature was ported over to Replanted but developers seem to have missed this part of the feature.
What jcbabgtohn62 is reporting, is the feature not working how it should be.
You can watch this video showcasing how it should work (from PvZ on mobile) :