it needs quotes ?

[postgres@olpgdb001 s1]$ grep max_wal_senders postgresql.conf

#max_wal_senders = 10           # max number of walsender processes

max_wal_senders = '0'           # max number of walsender processes

[postgres@olpgdb001 s1]$ cat postgresql.auto.conf



[postgres@olpgdb001 s1]$ pg_ctl start

waiting for server to start....2025-08-28 16:20:54.437 CEST [3333] LOG:  redirecting log output to logging collector process

2025-08-28 16:20:54.437 CEST [3333] HINT:  Future log output will appear in directory "log".

 done

server started



postgres=# show  wal_level;

 wal_level

-----------

 minimal