If you go into System Preferences > Network, choose the action menu, and “Set Service Order …”, and make sure that Ethernet is in the table above Wi-Fi, then you don’t need to do anything to switch; connect and disconnect as you like, and as long as there is no session in progress, the selection of addresses always favours whichever interface has priority. I do this all the time when switching between Thunderbolt, Ethernet and Wi-Fi and it works pretty reliably, so long as you make sure only to connect to whatever network resources you want after you’re connected to the cable and not before.
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