i tried that but the uninstall button was not lit up
Please try again, follow the instructions in the link.. Go to settings, then apps, scroll down to MS items, on my phone I had 2 MS Launcher and MS whatever, I uninstalled the second item (forget what the exact name was, I clicked on it and it opened and I went to where I could delete it and my phone then reverted to the default scree.n. I turned off my phone and then restarted the phone and went back through setting, then apps and scrolled down to MS Launcher opened it and the uninstall button was highlighted, I pressed the button and the app was removed, now everything from MS is gone from my phone.
Chuck