If you see the same thing on both displays, you should start by making sure the displays are Extended instead of Mirroring ...

How to use a laptop with multiple monitors: The ultimate guide If you work exclusively with your laptop, and enjoy media or play games, a second or third screen is a must.

Many MacBook Airs only allow you to connect one external monitor. Here is how to connect two or more displays to boost your productivity even more.

The new MacBook Air with M3 processor supports two external monitors — when the lid is closed. Here's what to expect when using Clamshell mode.

If a dock or hub says that it's compatible with Macs and has two or three HDMI ports but doesn't have DisplayLink, you can't use it to run more than one external display on a MacBook Air.