So you want to stop the Adobe Creative Cloud app from auto-launching on login? Adobe doesn’t provide any option for stopping this annoying progrom, and for some reason it is not registered in OS X’s user login options.
It is loaded by default by /Library/LaunchAgents/com.adobe.AdobeCreativeCloud.plist.
If you run in a terminal window the following command
launchctl unload -w /Library/LaunchAgents/com.adobe.AdobeCreativeCloud.plist
that will disable it for you in your user account.
To turn it back on
launchctl load -w /Library/LaunchAgents/com.adobe.AdobeCreativeCloud.plist