Formatting lists is completely, totally counter-intuitive. It yook me years to understand how it works and some more to master the process. Unfortunately there are still lurking bugs which prevent to follow a rigorous method, as least as systematic as for paragraphs, characters or pages.
By chance. I selected the number, applied colour and was surprised that the change occurred on the preceding number. I then checked it was systematic and deduced the recipe. Perhaps this works because DF is applied in fact only on the paragraph mark of the target item.
You’re not the only one. A few years ago, I used to say that mastering list formatting was the most difficult challenge in Writer. I wouldn’t be as affirmative today. I’d put deterministic frame location through frame style in number one.
You’re welcome. This challenge is very interesting because it improves my skills with Writer. This is a win-win deal. You have a solution and I have higher knowledge in Writer.