I have a 3 column setup (mb,sa,sb). I have ascribed all the modules on sidebar-b the class "visible-large". I would like these to disappear when the display is not large. Of course, I would also like the sidebar-b to leave room to the mb and sa when no modules are displayed in it.
The classes are working, the module on sidebar-b disappear whenever I am not in large window, but the sidebar-b is still present even though empty. This implies that sidebar-b behaves like it is a forced position.
Is there a way to prevent this behavior and have the sb disappear when no modules are displayed in it?