Website side navigation has no collapse-below option

[declann]

Description

From Quarto docs (and from experimentation), navbars have a handy collapse-below but sidebars don't.

https://quarto.org/docs/websites/website-navigation.html

On some of my pages I want a sidebar but it isn't critical; I tried to collapse it by default on most screensizes by increasing the responsive breakpoint via collapse-below but this is only possible for navbars, not sidebars.

I think would be useful (and more consistent) if sidebars also supported collapse-below? (especially if it happens to be easy?!)

[mcanouil]

I opened an issue to track this which I think is a good idea.

• Add collapse-below option to side navigation (website) #6457