Planned failover refers to a series of steps that occur at the end of the failover process to control the state of the protected site and ownership of VMs. Planned failover is typically used for non-disaster related events such as seamlessly shifting the location of VMs and their workloads while they continue to operate (i.e., migration). It shuts down the domain at the protected site (gracefully) before transferring ownership of VMs and data to the recovery site.
Refer to the article “What is: Failover?“ to learn more details about post-failover options (regular, planned, and forced).