Here’s a github link if you’re into running .reg files from random websites.
You can disable this by opening regedit and changing the dword below.
You may need to create the keys if they don’t already exist.
[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\General]
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\General
“DisableComingSoon”=dword:00000001
DisableComingSoon
Restart everything office related or your computer to apply. It won’t remove the one in Outlook. Hopefully MS removed that by the time you’re reading this.