BuddyPress.org

hi

I am not sure about ,,what you mean by residing the navbar at the bottom of header field.

do you want to put it under the logo or just align with the bottom of logo ?

For not allowing the navbar to collapse with the logo,

Just fix the header width.

something of this sort will help.

#header{width:1000px;}

Put it in your screen.css or find the #header selector and put the width you want there.