This dialog box is displayed when you attempt to exit X Manager when sessions are still running. You can choose to stop them, leave them, or cancel the exit operation. The choices you are offered depend on how you're running X Manager and how you have configured your preferences.
X Manager (standalone): You do not have the option to leave a session. You can stop the session or cancel your exit operation.
X Manager for Domains: The option to join and leave a suspended session is available when Remote session services is configured for a suspend/resume option.
As you exit X Manager for Domains, any sessions that you have already left will remain running.
This dialog box appears when the setting On exiting X Manager is configured to Prompt in Preferences. You can change this behavior:
Choose Leave (X Manager for Domains) or Stop and then select Remember this choice.
Change the setting in the Preferences dialog box. You should also use this setting if you want to change this behavior again.