Problem managing slots in Patroni

Hi,

I use patroni version 3.2.1. There is a point that I do not understand in
the slots management with Patroni.
Patroni creates a slot automatically on primary node when there is a
standby attached, although this slot does not belong to the patroni
configuration.
How to prevent the automatic creation of this slot?

Thanks for helping

Here is Patroni configuration:

slots:
barman_x:
type: physical
barman_y:
type: physical
logic_slot:
database: test
plugin: pgoutput
postgresql:
use_pg_rewind: true
use_slots: true