Follow-up on 2023-10-30_07-54:

I think the best possible solution would be to keep just the 1st, 2nd, and 3rd levels in the outline.

1. 1st level should be visible since that’s my entry to a main branch.
2. 2nd level should be visible because these are idea threads which can be developed.
3. 3rd level should be hidden though because these can be real rabbit holes which needs digging down into actual notes. I show them by expanding the 2nd level.

All other levels can be removed. This would keep the outline usable.