Dear MikroTik specialists!

We need help with the configuration of a MikroTik CRS328-24P-4S+RM / activation of IGMP - Snooping & fast-leave.
Hardware information:
CRS328-24P-4S+RM
version: 6.47.9 (long-term)
build-time: Feb/08/2021 12:48:33
factory-software: 6.44.6

We are able to activate IGMP-SNOOPING vià command line with the following command: In this manual: https://help.mikrotik.com/docs/pages/vi ... d=59277403
is described to activate fast-leave option, but in our CLI there is no option: Why this option is not available?
We would apply this as a Layer2 option

We kindly ask for help.
Thank you!