I am not sure there have any setting which related to "time-out" function

For example, when I log in to service desk page, and haven't any action after a short period (e.g. 15 mins)

there will have pop-out window which show you will be log-off after xxx mins

Or, It will automatic log out, and I need to log in again if I need to use service desk plus again

Could anyone can advise how can set this function

Thanks and regards,