If you wish to carry out a a complete repair of your Office 2019/2016 or Office 365 installation on your Windows 10 PC, you can choose to undertake an Online Repair.

Quick Repair runs faster but only detects and replaces corrupted files. Online Repair takes longer, but does an uninstall and a complete repair.

To carry out an Online Repair, open Control Panel > Programs & Features. Here right-click on Office installation and select Change. You will see the following box.

Select Online Repair and let setup do its work.

This post offers additional options on how to Repair Office & Uninstall individual Microsoft Office programs, along with help of switches.