Since the GPO ADMX for it doesn't seem to be working on Windows 10 Professional, here is a quick command you can run that will make an immediate registry change and turn it off.
reg add "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Feeds" /v ShellFeedsTaskbarViewMode /t REG_DWORD /d 2 /f
This fully hides it. If however you want it back on change the DWORD value. Enter 0 (show icon and text) or 1 (show icon only).