In Klenty, you cannot delete/remove prospects from the cadence altogether once you have added them. But you will be able to stop the cadence for the prospects, which is equivalent to deleting/removing them from a cadence.

In order to stop cadence for the prospects, Open the cadence > Prospects > In Cadence > Filter(if needed) > Select All or just the required prospects > Stop Cadence

This action will move prospects from the In Cadence status to the Stopped status.