Thanks

I like to collapse only some item in Left Nav. In the give example , we want some thing like this , other than document navSubMenu every item should be collapsed.

Can we do this. If yes how ??

Put this little css markup in a Content Editor Web Part on the page you want to remove the quick launch area:

<style>
<!-- Remove the Entire quick launch bar, including the space it resides in -->
.ms-leftareacell, .ms-titlearealeft {
  display: none;
}
</style>

How can I achieve the below scenario:

When I click on any of the menu header box, it exposes. Again if click on the second header it should close the previous Menu header (first exposed one).
I mean to say only one menu header should expose at a time.

Please suggest…