You can also check this link for uninstalling Microsoft Office 365.
1. Open the Control Panel. Opening the Control Panel depends on your version of Windows.
Windows 10
In the search box on the task bar (lower-left corner), type "control panel", then select Control Panel.
Select Programs > Programs and Features, then right-click your Microsoft 365, and choose Uninstall.
Windows 8.1 or 8
Right-click the Windows Start button (lower-left corner), and choose Control Panel.
Select Programs and Features, then right-click Microsoft 365, and choose Uninstall.
Windows 7
Click Windows Start Button (lower-left corner) > Control Panel.
Click Programs > Programs and Features.
Right-click the Microsoft 365, and then click Uninstall.
Windows 10 Search box
Windows 8/8.1 Start Button
Windows 7 Start Button
2. Follow the prompts to complete the uninstall.
3. Your Microsoft Office 365 2016 is now uninstalled.
Note: You have to restart your device to complete the process.
You can also check this link for uninstalling Microsoft Office 365