Change the order of the network services your Mac uses

If you connect to the internet or a network in several different ways (using Wi-Fi or Ethernet, for example), you can change the order of the network connections your computer tries when you connect.

If you have multiple active connections, your computer tries the one at the top of the list first, then tries the others in descending order.

You can’t change the order of virtual private network (VPN) connections because they already take priority over non-VPN connections.

On your Mac, choose Apple menu > System Settings, then click Network in the sidebar. (You may need to scroll down.)
Open Network settings for me
Click the Action pop-up menu on the right, then choose Set Service Order.
Drag services into the order you want.
Click OK.

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macOS User Guide

Change the order of the network services your Mac uses