Well. the problem has been solved without my extra action. After all I decided to check this feature disconnecting LAN in MR18 . The result was positive. The mesh after configuration was working without any information about mesh neighbors, after about 2 hours dashboard were refreshed and finally display mesh neighbor and information about connection quality.
Maybe the time gap between MR18 and new MR33 is quite big, but it's working - good job Meraki
PS
Throughout between them is established speed equal about 73 Mbps so it's true what Meraki claim thet Mesh connection is about 50% of maximum APs throughput. (MR18 is N Type AP)
Thanks for trying to help me
Regards