You could simply do it by merely managing your recommendations and search results. Do note that your social media accounts are synced to one another. Meaning to say, your searches from one site may influence others. Though weird at first, don’t fret with how it works. Rest assured that google is not stalking your cyberspace activities. One of the many effective ways to alter this feature is to go to your settings, then applications, choose your desired app, then clear its storage cache. You may as well remove specific videos or searches from your watch and search histories from time to time.

Hi Ellie. It should be automatically removed. If you want to check how much storage the app consumes, go to Settings -> Applications -> tap an app -> Storage.