In YouTube, the related videos are displayed after the video is finished. On a website, this is very undesirable since you don't want users leaving your site or being shown videos of competitors. YouTube Showcase Pro allows disabling related videos per video. Follow the steps below:
This will remove the related videos section at the end the video. If you need to disable related videos in all videos, you do not need to do it manually. Do it in bulk using the integrated YouTube Showcase Pro import/export/update functionality:
If you're using YouTube Showcase Starter edition, you can purchase Import/Export/Update addon.