Run at the publisher to enable or disable the automatic replication of schema changes.

--Enable schema change replication:
EXEC sp_changepublication
	@publication = 'publication_name',
	@property = 'replicate_ddl',
	@value = 1, --Enable
	@force_invalidate_snapshot = 0,
	@force_reinit_subscription = 0

--Disable schema change replication:
EXEC sp_changepublication
	@publication = 'publication_name',
	@property = 'replicate_ddl',
	@value = 0, --Disable
	@force_invalidate_snapshot = 0,
	@force_reinit_subscription = 0