Why when I'm going down, it does not expand on "Application", and when I'm going up, it does not expand on "Features"? I would expect them to work consistently.

Also when going up, I feel it would be more natural to go to the last sub-section of the prev section. Namely, when pressing "Up" on B.1, it should go to A.2, not A.1

• A
  • A.1
  • A.2
• B
  • B.1