Raspberry pi 4 clone displays?

[verrochio]

Hey, I couldn't find any information on how I go about cloning the displays on the new Pi just like the "Clone" display in windows or mac.
Does anyone have any ideas where to start looking? The included display settings app donesn't seem to have any option for display mode.

[6by9]

The Screen Configuration app allows you to overlay the two displays, therefore giving you a clone (that tends to be the default).

What isn't exposed by that application is scaling the screens should they be different resolutions. The simplest approach to solving that is to change the resolution of the display. Alternatively xrandr does support a --scale option, however that resize is fairly inefficient and hit performance quite badly when I just tried it (xrandr --output HDMI-2 --same-as HDMI-1 --scale 2.0x2.0)