To pause a product/ASIN within an existing campaign, please take the following steps:
1. Go to Ad groups tab and celect the specific ad group your product is within by clicking on the name of the campaign.
2. Then, the webpage will be refreshed so that only the selected campaign remains in the Ad groups tab. Click on the name of the campaign again. Then, go to the Products section and find the product you wish to pause/enable/archive.
3. Click on the drop-down icon to the left of the product image and select the status.