1) Go to Settings.
2) In the search box type uninstall and click on Add or remove programs
3) In the list of programs scroll down until you find Microsoft Office Professional Plus 2016 and click on it.
4) Click Uninstall.
5) Once again click Uninstall.
6) When the Setup window pops up asking if you are sure you want to remove Office, click Yes.
7) Just wait for the uninstall procedure to complete.