What Does Non-Persistent Desktop Mean?
A non-persistent desktop is a desktop where nothing gets saved at the end of the user session. Any files that have been saved on the desktop, settings or shortcuts are all lost at the end of the session.
Techopedia Explains Non-Persistent Desktop
A persistent desktop is more desirable than a non-persistent desktop for many projects. A persistent desktop mimics the earlier network systems where users were accessing physical disk images, and could permanently change that disk image with commands. With a non-persistent desktop, on the other hand, it is impossible to change the desktop permanently or store files or folders.