XF 2.1 Block Header Collapse Button/Slider

Alfuzzy

Well-known member
I've noticed on various Xenforo websites a button or slider on the far right side of each major subject header...which allows the visitor to collapse or expand that particular major subject & it's sub-forum's.

block header slider.png
Is this a built-in setting...or a feature added via an addon? If built-in...where do I find it please?

Thanks
 

 
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