Question: collapsible regions or sections

I watched a webinar training:   Maple Training for Engineers, Researchers, and Scientists.


The file demonstrated topics and used collapsible regions with a colored band across the document and a + / - sign on the left to open/close the section or region.  Different than the document gray down arrow.


I have searched all the documentation and can not find how to do this.   I have done this in other programs like MathCAD to close and lock a region from viewing or editing of specific formulas.


Any help always appreciated.




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