Directives :

Directive	Selector	Description
NgbCollapse	[ngbCollapse]	The NgbCollapse directive provides a simple way to hide and show an element with animations.

Refer following links for usage:

Type	URL
NG-Bootstrap Page	https://ng-bootstrap.github.io/#/components/collapse
Bootstrap Page	https://getbootstrap.com/docs/4.0/components/collapse/
Template Page	https://modernadmin.evolvision.com/components/collapse