MP. Console. Peaceful mode

[DRBLN]

Please,advise how to enabe it in MP.
This command didn't work:
/c game.player.surface.peaceful_mode = true

[Daid]

untested, but no reason why it wouldn't work.

/c game.surfaces[1].peaceful_mode = true

[Mooncat]

You have to kill all existing aliens to refresh their states, because peaceful mode is applied to the units, not the game or map.
/c game.forces["enemy"].kill_all_units()