Steps to reproduce
Have a list with children and grandchildren items, toggle ‘Number children’ from the document title item menu.
The “>” or “filled right pointing triangle” symbol to the left of the parent is unaffected.
The “>” or “filled right pointing triangle” symbol to the left of the parent disappears when “Number children” is off.
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I like having an always-on symbol to indicate parent items with collapsed children. I very much dislike when they disappear. But I also dislike number mode. For now I will live with the numbers, as they are less objectionable than losing the symbol.