Change the default shell in Terminal on Mac
You can change the default shell that new Terminal windows and tabs open with.
In the Terminal app on your Mac, choose Terminal > Preferences, then click General.
Under “Shells open with,” select “Command (complete path),” then enter the path to the shell you want to use.
In a networked environment, a system administrator can specify the default shell. For more information about the features of each shell, enter “man” and the name of the shell.