priPrinter allows you remove non required pages. You can do it in the few ways.
1. Click on visibility check box below any page in the left window. It will switch page visibility status. When checkbox is unchecked page is not visible in the right window. However it still exist in the left window.

2. Second way will be in selecting pages and pressing Delete key. Pages will be removed from left and right window. You may restore these pages by right clicking on Job header and selecting "Restore Delete Pages". Of course you can use undo for this.
3. You may toggle visibility of whole job by selecting such item in job context menu. Whole print job can be removed via Job context menu or by pressing close icon.