Galaxy Note 3: Floating Youtube suggestion popup window doesn't go away even though I've turned off notifications

[followyourheart89]

Every now and then during the day I get a floating popup window from Youtube on my Samsung Galaxy Note 3 with suggested videos. You can hold and drag it to an 'X' to close it. It annoys me so I switched off notifications for Youtube. But it still won't go away! I've tried everything - trying to find settings on the phone and in the app itself, searching online to see if others have the same problem - but I find nothing. How do I turn it off?