Stop Your Mac From Automatically Connecting to a Wi-Fi Network

 

First, open the System Preferences window by clicking Apple menu > System Preferences.

Click the “Network” icon in the System Preferences window.

Select the “Wi-Fi” option in the left pane and choose the Wi-Fi network you want to modify from the Network Name box.

Uncheck “Automatically join this network” and your Mac won’t automatically join the Wi-Fi network in the future.

You can also set the order of your Wi-Fi networks to tell your Mac to prefer certain Wi-Fi networks over other ones. Your Mac will try to connect to available Wi-Fi networks in the order you choose, preferring the ones at the top of the list.