Choose "Leases" from the List menu on the left.
You will find the lease page with grids of information about all leases.
Just click on the lease you wish to know more about.
This redirects you to the main lease page for that particular tenant.
Click on the "More" button on the top right corner and then click on "Void Lease" Button to void the lease.
You will then get a pop-up, warning you on the action and asking for your confirmation to proceed.
Drop in a comment as to why you'd wish to void that entire lease, and hit on "YES",
A pop-up will confirm on the deletion of that entire lease.