Sticky Region Option Not Showing In Upfront

G'day everyone,

I can't find the option to make a region sticky for the main site on my network. As a test I installed Spirit on a subsite and the option is there.

Also I noticed that on the subsite the sticky option will only show for the Header region. Im guessing that since I replaced that region with another one on the main site, it results in me not being able to enable it to be 'sticky'.

How do i get the option / enable other regions to be 'sticky' ?

Thanks,
Stephen