The XDK project files are stored in folders on your local disk, they are not stored in the cloud. So you would need to make a copy of your project on the other machine and then use the "open an XDK project" button on the lower left of the Projects tab. Or place the project on a network drive where you have access to it from both machines and use the "open an XDK project" button to add it to your project.
It is important that if you put the project onto a shared network drive you should only open the project from one copy of the XDK at a time. Trying to open the same project from two instances of the XDK will not go well, do not do that!