This library is just an awesome box to start with angular while dependent on bootstrap css. I’m creating a navbar and just got through an issue here. Probably it’s a new-feature request or it can be said as a bootstrap-feature not yet in ng-bootstrap.
Look at this link where you can set collapsible navbar based on the size of the screen.
Bootstrap 4 documentation for navbar
This can be seen in
responsive navbar section of this link. To the point, it actually uses
navbar-toggleable-xs class to define this functionality. The navbar comes collapsible only when the screen size is xs, otherwise, its a regular navbar.
Version of Angular, ng-bootstrap, and Bootstrap: