Change the default shell in Terminal on Mac
The default shell is zsh. You can change the shell that new Terminal windows and tabs open with.
In the Terminal app on your Mac, choose Terminal > Settings, then click General.
Next to “Shells open with,” select “Command (complete path),” then enter the complete 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.