"1. Press Windows, type Manage BitLocker;"
You do realize that typing this just returns Bing search results, yes? It doesn't actually show any settings?
I even went to Privacy & Security in settings, and there is nothing in there to manage BitLocker, either.
However, if you go to Settings, and type "BitLocker" there, you will get "Device encryption." Form there, you can turn off BitLocker encryption.
And I'm not an independent advisor, I'm just a person who actually looks at the screen when figuring this out.