If the Microsoft Office Click to Run service is using a large amount of disk space, it could be because it is storing the installation files and updates for the Office applications that are installed through Click to Run. The service downloads these files in the background, so they can be used to install and update the applications as needed. If you are concerned about the amount of disk space being used by the Click to Run service, you can try uninstalling any Office applications that you are not using, or you can try manually deleting the installation files that are stored in the Click to Run cache.
