I am sorry I commented in a previous answer without providing an answer myself. I have been working on this for the past several days (obsession) and don’t find anyway to get rid of this. Finally I did a full factory reset after stopping all updates on Google Play and the automatic restore on the phone and it not only appears again, it has another toolbar with it. Actually I did this 4 different times, all the while stopping everything that could be stopped. Finally I closed down my Google account entirely and then did a factory reset. The result, its back. File Manager comes with the phone but until an update last week it was unobtrusive. I have never downloaded it deliberately or rooted my phone or downloaded an APK file or anything other than Google Play apps. My phone is Alcatel One Touch Idol 3 model 60451 running Android 6.0.1 There are now a lot of people with this problem and like many of them I will never buy another Alcatel and will advise anyone I know to do the same. That is the only solution I can find so far.