If you manually move an item relative to its siblings, automatic sorting stops. You will then be able to manually place items wherever you want them (again - relative to their siblings).
To go back to automatic sorting, choose Tree - Sort.
You can tell if URP wants to sort the siblings by looking at the Tree menu. If Sort is checked, then you've got the sorting function on. When you move an item, as above, you'll see that the Sort is unchecked.
Hope this helps.
- Bal
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