With the release of the M3 MacBook Air, Apple introduced a new feature for M3 laptops. These MacBooks can now run two external displays, but the laptop must be closed. It’s a handy feature for production environments or for presentations. This feature is also coming to the M3 MacBook Pro in a future macOS update.
The two external displays must support a video connection over USB-C or Thunderbolt 3. Also, the two displays can each be 5K at 60Hz, for example, two Apple Studio Displays.
Here’s how to use dual external displays on M3 MacBooks. This demonstration involves a 15-inch M3 MacBook Air, an Apple Studio Display, and the Dough Spectrum One, which is a 4K display with a variable refresh rate.
Read more at Macworld.com