You can sort notes one time by right-clicking parent note in the note tree, Advanced -> Sort notes by ...

Child notes can be kept sorted by attaching labels to the parent note:

• #sorted - enables sorting, can optionally include name of the note's property/label (see details below)
• #sortDirection - by default ascending, set it to desc value to reverse the sort order
• #sortFoldersFirst - notes with children will be sorted on top

Sorting works by comparing note property or a specific label on the child notes.

There are 4 sorting levels, where the first one has the highest priority and the lower one will be applied only if the 2 compared notes are equal based on higher priority comparison.

1. implicit sorting by #top label - child notes with this label will appear on the top of the folder.
2. implicit sorting by #bottom label (since Trilium 0.62) - child notes with this label will appear on the bottom of the folder.
3. sorting by child's property or a specific label defined on the parent note's #sorted label a) parent note has #sorted with no value - by default sorting will be done alphabetically b) parent note has #sorted=title or #sorted=dateModified or #sorted=dateCreated - sorting will be done based on the defined note's property c) parent note has #sorted label with any other value - this value is the name of the child note's label, whose value will be used for sorting. So e.g. you set #sorted=myOrder on the parent note and then child notes will have labels #myOrder=001, `#myOrder=002" etc.
4. sorting of "last resort" is alphabetical

All comparisons are made string-wise - e.g. "1" < "2" or "2020-10-10" < "2021-01-15" but also "2" > "10".