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I've associated both roller shutter and switch in group 2 (screenshot)
What more should I do ? I expect that roller will start to shut down on double pressed button but nothing happens.
Which mode should I use ? (screenshot)

I'm using probably recent version of Z-Wave.Me software (1.7.1)

Basically you are right, but check manual of TZ66S for the meaning of group 2.

This is TKB specific, so on this forum maximum you can get is someone's else experience.

I have answer.
TZ66S doesn't support multiple groups. It supports only group 1.
They removed that support for some reason.