lucidck wrote:
Hi, I just set up to external monitors to my Macbook Pro 2019 and the two external monitors are mirroring one another and I want them both to have their own screens along with my laptop. So three separate displays. My mirroring is turned off on my Macbook so I don't know what else to do...
Click the ? at the lower-right of the "Arrangement" tab of "Displays" system preference.
"To set up a combination of displays showing mirrored and extended desktop images, set up the three displays as an extended desktop, then if desired you can Option-drag a display icon onto another display icon to mirror the two displays."
command-F2 will toggle the setting of [√] Mirror displays
Get help with video issues on external displays connected to your Mac -
Apple Support
https://support.apple.com/en-us/HT201177