Installing Parallels Tools
Parallels Tools is a collection of utilities and drivers that vastly improve the virtual machine performance and enable some features that are not available otherwise. Parallels Tools are included with every copy of Parallels Desktop and are highly recommended to be installed in every virtual machine right after an operating system is installed in it. Your source virtual machine should have Parallels Tools installed. For instructions on how to install Parallels Tools, please see https://kb.parallels.com/en/115835 .