Actions taken in one browser tab don't affect the idle timer of the window or tab that has Control Hub open. Users must be active in each window or tab with Control Hub open within the time set or they will be signed out.
The available values that you can set for an idle session timeout are:
20 minutes – This is the default amount of time that Control Hub sessions can remain idle.
From the customer view in https://admin.webex.com, go to Settings, and scroll to the Idle Timeouts section.
Turn on the switch beneath Control Hub Idle Timeout.
Below Control Hub Timeout, select the amount of time that Control Hub users can stay idle.