From the left panel, click on your “Ads” choose which advertising you wish to edit (Sponsored Products/Brands/Display) for this video will use Sponsored Products
After clicking on “Sponsored Product” you’ll first see your campaign data now click on the “Product Group Network” tab and chose the PGN you wish to archive
On the PGN chosen, click the “Action” button (3 Dots)
Chose “Archive”
Note: Make sure before archiving any entity on your account, once archive you can never retrieve and put it back to enabled.