How to delete a print from a Reproduction Run:
Click on Artwork in the left-side menu, then click on Runs/Reproductions underneath. Select the Run for which you want to delete a print.
Click on the blue trashcan icon next to the right of the print you want to delete.
How to delete a Reproduction Run:
To delete an entire Run, Click on Artwork in the left-side menu, then click on Runs/Reproductions in the top menu. Select the Run you want to delete.
Scroll down to below the Run Info, then select Delete this Run in blue.