Explanation
References:
https://blogs.technet.microsoft.com/office_resource_kit/2014/01/17/office-365-proplus-multiple-devices-and-dea When you deactivate a Microsoft Office 365 ProPlus license, Office 365 ProPlus remains installed on the computer, but you can only view and print documents. All features for editing or creating new documents are disabled.
References:
https://docs.microsoft.com/en-us/deployoffice/overview-of-licensing-and-activation-in-office-365-proplus