Where is the switch menu on Xiaomi 4A Gigabit?

I am a new user and I installed the latest OpenWrt 21.02 on my new Xiaomi 4A Gigabit version couple of days ago and everything seems to working great. It just seems that the Switch menu in Network (Luci) is missing for some reason.
Could somebody provide an explanation why it isn't there?

21.02.0 version of OpenWRT uses DSA, so network config has changed significantly. See release notes of 21.02.0 version.

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Thank you. It clear now.

On more question.
What is the purpose of the 'eth0' device which has the same MAC as lan1 and lan2?

I also noticed that device, does anyone know what it will be for?