Hi Manu,
What do you want to achieve?
In user decision step, You will have outcomes for each option you include(Approve, reject, Display). When you click on Display, the outcome(branch) corresponding for that will get executed and the workitem will disappear from your inbox.
If you have activated Confirm end of processing, it will confirm you with a pop up. If you donot confirm, the workitem should stay in your inbox, with workitem status as "in progress". Check in the workflow log, if there are any events which terminates the workitem(End events, Fork step, wait step, etc).
Regards,
Karthikeyan