How can I close a terminal session

From within the Terminal app, type

exit

and then quit the Terminal app.

RetiredRR2 wrote:

I upgraded from High Serria to Catalina now I have issues Norton help desk turned on the Terminal prompt on my Mac how do I turn off ?

Typically third party Anti-Virus does nothing but add issues and compete directly with Apple’s® own built in Security:

Uninstall all third party apps that are Cleaners/Optimizers/Anti-Virus/VPN

macOS - Security - Apple https://www.apple.com/macos/security/

Apple Platform Security - Apple https://support.apple.com/guide/security/welcome/web

Don't let Norton or any other AV app mess with your mac.

Get uninstall instructions from the developer and get rid of it.

Click the Terminal app icon in your dock.

Then in the menu bar at the top of your screen click Terminal > Quit Terminal.

You're welcome.