If you check it out from the red cross sign, it will close down but it will keep running in the back ground.
Rajshree, the problem is that I have to click the X over and over again. The window keeps spontaneously coming back. I'm not sure you understood my question exactly.
Please uninstall your CC apps and then remove the Adobe Creative Cloud Desktop App by using this link:
Then download the Adobe Creative Cloud desktop app from this link :