The top frame of the editing interface is keeping your lock because you are still editing the asset. If you move away from that asset, or close the interface, your locks will expire. Our goal is to not let your lock expire while you need it.
[quote]I wonder if I set interval time in System Configuration = 0 or do not enter anything.
Does that mean no releasing until user presses Release Lock(s) button??[/quote]
The interval has a min value of 60 seconds. here is no way to stop the top bar refreshing and no way to stop a lock from being released until they press Release Lock.