I've connected two monitors to my MacBook Air M3 via a port connector(Targus). Both monitors work, however the image is the same on both. In the display settings, only one monitor is detected. How do I detect both monitors so that I can extend across all screens?
[Re-Titled by Moderator]
Note that you must close the lid of the M3 MacBook Air to use two monitors.
Use dual monitors with your MacBook Air and MacBook Pro with M3 chip - Apple Support
This is more flexible than the arrangement with the M1 and M2 MacBook Airs, where the limit is one external display period (because one of the chip's outputs is dedicated to the built-in screen full-time).
Note that you must close the lid of the M3 MacBook Air to use two monitors.
Use dual monitors with your MacBook Air and MacBook Pro with M3 chip - Apple Support
This is more flexible than the arrangement with the M1 and M2 MacBook Airs, where the limit is one external display period (because one of the chip's outputs is dedicated to the built-in screen full-time).
To connect two monitors to the same Mac host port,
Some docks use the equivalent of DisplayPort MST daisy-chaining to drive more than one monitor off of a "plain" USB-C dock, or more than two monitors off of a Thunderbolt dock. Some Windows PC support that, but Macs do not. Often the result is that the dock feeds a single video signal to two or more monitors. The Mac only detects a single monitor, and the extra monitors display a "mirrored" signal that the dock is feeding to them.
Looking on the Targus site, I see a number of docking stations. Most are not Thunderbolt docks, and some of the docking stations use DisplayLink (rather than hardware-supported video output) to drive some monitor outputs.
My guess would be that you are not using a Thunderbolt dock.
How to extend displays across two monitors on MacBook Air M3?
