I have als interactive shell only.
From Arch wiki "Setting fish as interactive shell only
Not setting fish as system wide or user default allows the current Bash scripts to run on startup. It ensures the current user's environment variables are unchanged and are exported to fish which then runs as a Bash child. Below are several ways of running fish in interactive mode without setting it as the default shell. "
Modify .bashrc to drop into fish
"Keep the default shell as Bash and simply add the line exec fish to the appropriate Bash#Configuration files, such as .bashrc. This will allow Bash to properly source /etc/profile and all files in /etc/profile.d. Because fish replaces the Bash process, exiting fish will also exit the terminal. Compared to the following options, this is the most universal solution, since it works both on a local machine and on a SSH server"
add line in home file .bashrc
exec fish