To mirror your mac display so that both screens show the same content return to the airplay menu which is a blue rectangle while using sidecar.
Mac monitor cable extension.
You can move windows to it and use it like any other display.
Connect a macbook chromebook or laptop with a usb c port to a tv monitor projector or other display with the platinum usb c to hdmi cable.
To turn on airplay follow these steps.
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If your mac and display have an hdmi port which is quite rare you ll just be able to use a hdmi cable to connect the two.
Similarly with a usb c equipped mac and monitor you will be able to use.
Choose in the menu bar then choose your apple tv.
The cable is easy to connect supports resolutions up to 4k and is 6ft long.
If an airplay passcode appears on your tv screen enter the passcode on your mac.
With apple tv you can mirror the entire display of your mac to your tv or use your tv as a separate display.
Make sure that your tv is turned on.