Advanced Despawn

How do i enable these options?
Use Alternate Despawn Routine (false) - may prove useful for those having issues with bases not fully despawning Teleport Entities Underworld Before Despawning (false) - may prove useful for those having issues with bases not fully despawning

this was removed. it does not work because you cannot teleport a building after it has already been spawned (without using hacky code which I refuse, and even then it would not help). it will reappear where it was in the next server frame.