How can I remove the price field from the Request tab?

The price field will be hidden in the next release of NSS.

Until then adding the customization below to your CSS section will hide the price field. To do this go to Admin>Theme>Custom CSS and entering this code.

.list-detail-view .list-pane .list-pane-content ol li:nth-of-type(5) {

  display:none;

}