I deleted the entire Search History on my youtube . I also "Cleared" AND "Paused" the Watch History of my account on youtube (see above link on how to do it). I Cleaned my browsing history in my browser, and I turned off Web History in my google account settings (how to do it) And yet, when I go to youtube and try some specific search words that I know how youtube used to complete them for me and it still doing the same!!
I searched on the internet and I found nothing can help about that...But there must be some way! do you know how???
There could be really many reasons someone doesn't want to see or show those suggestions on a shared computer/smart-tv. It could be privacy(personal), protection(kids), or anything else...you pick yours, if you have any...