Maybe helpful,...

You can setup a default for room creation on server. For a private server maybe something like this:

Component "chat.domain.tld" "muc"
  modules_enabled = { "muc_mam", "vcard_muc" }
  name = "Chaträume - Konferenzen"
  restrict_room_creation = "local"
  muc_room_default_public = false
  muc_room_default_persistent = true
  muc_room_default_members_only = true
  muc_room_default_moderated = false
  muc_room_default_public_jids = false
  muc_room_default_change_subject = false
  muc_room_default_history_length = 20
  muc_room_default_language = "de"

You may also want MAM for MUC

muc_log_by_default = false
muc_log_presences = false
log_all_rooms = false
muc_log_expires_after = "3w"
muc_log_cleanup_interval = 4 * 60 * 60

The configuration also may depends on the client.

CC: @debacle@framapiaf.org @QuadRadical@wetdry.world

Edit: shouldn't