Search within Responsive Self Service Procurement

Summary:

I've been looking at the Responsive Self Service Procurement module and at the bottom of the screen, I've only got two options, i.e. Self Service Procurement and Cart.

Content (required):

All screenshots and references to RSSP show 3 options at the bottom of the page. The third being a 'Search' option which I don't seem to have available to me. Any ideas how I can get this, and what does the search actually search on? Is it existing requisitions? If so would this be exclusive to that end user or would they be able to search other users requisitions too?