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I am new to Mathematica so I am sorry if the question is rudimentary. :)

When I was reading the help page, I noticed that there is a structure like the picture below for the topics in the help page which I call it the tree form. The menus open and close by clicking on head arrow things next to the topics. I searched on how to make such a structure in a notebook but I could not find anything. Is there a way to do this? Do they have a formal name? I could not find them in styles!

enter image description here

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    $\begingroup$ I think you need to read a little bit of docs, here's good start: /NotebooksAsWolframLanguageExpressions $\endgroup$
    – Kuba
    Commented Feb 10, 2016 at 19:59
  • $\begingroup$ @Kuba: I already read some documents about notebooks but I couldn't find anything on how to make these structures. Already I know about styles and cells used in a notebook. There was nothing about these drop down menus of titles which I called tree form. :) $\endgroup$ Commented Feb 10, 2016 at 20:01
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    $\begingroup$ I see, what you need is ShowCellGroupOpener->True option which is False by default for Sections and friends, I don't know why :). Triangle that collapse cells. Counts of examples are done manually, but if you need something automatic: How can I make a stylesheet that counts subcells? $\endgroup$
    – Kuba
    Commented Feb 10, 2016 at 20:06
  • $\begingroup$ @Kuba: Thanks, I think it is a nice post that you referred. $\endgroup$ Commented Feb 10, 2016 at 20:09

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