Sidebar module positon automatically collapse when empty?

Hi
I am running
joomla v3.3.3
Moset Tree 3.5.10
t3-blank template latest (not t3-bs3)

Is it possible to have the sidebar positions automatically collapse when there is no module published to the position

I remember that all the templates did this before they went responsive

When using moset tree I want to have 2 sidebars when viewing the summary results and only one when viewing the listing details page with the content taking the extra space available

Best regards

Ashley