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With the Default stylesheet (in Mathematica 13.1 and several versions earlier), the new kind of group opener for sections, subsections, etc., appears as in this screenshot:

group openers by default

When I apply a certain stylesheet to the notebook, it loses those group openers. (The stylesheet is a variant of David Park's Presentations stylesheet.)

What option(s) do I set, and with what value(s), in the Option Inspector to restore those default group openers?

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  • $\begingroup$ I think I have it: open the stylesheet, select Section style, open Option Inspector, and change Cell Options > Display Options > ShowGroupOpener to Inline. Ditto for Subsection, Subsubsection, etc., as desired. $\endgroup$
    – murray
    Aug 15, 2022 at 20:53

2 Answers 2

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Open the stylesheet, select Section, open Option Inspector, and change Cell Options > Display Options > ShowGroupOpener value to Inline. Ditto for Subsection, Subsubsection, etc., as desired.

Select style from stylesheet

Set Inline as ShowGroupOpener value

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I never used David Park's Presentations stylesheet (and I know that he stopped supporting it a long time ago), but in this answer b3m2a1 demonstrated how to attach a GroupOpener to a CellGroup using FrontEndResource["FEExpressions", "cellGroupOpenerInline"].

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  • $\begingroup$ Does not seem to work. If I execute this before the first Section cell, nothing happens when that cell group is closed; if I execute it before the first Subsection cell of that section, again nothing happens. $\endgroup$
    – murray
    Aug 15, 2022 at 18:41

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