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When I re-open a previously saved notebook in which a group of cells is expanded, the group opener sign does not appear. See, for example

enter image description here

However when I collapse using the right-side group tracks and re-expand it using the opener button, it appears

enter image description here

Is it possible to make it appear when I open the notebook by default? Is this a bug? I know about ShowGroupOpener, but not sure how to make it work. Any ideas?

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  • $\begingroup$ Has this been confirmed as a bug? If not, the bugs tag should not be used. Have you contacted WRI to report this behavior as a bug? If so, perhaps they may provide a workaround. I’ll remove the bugs tag until this is confirmed as a bug. $\endgroup$ Jul 8 '21 at 15:06
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This simple command will give you GroupOpeners in front of your segments:

SetOptions[EvaluationNotebook[], ShowGroupOpener -> True];

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