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

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.

Luckily, I saved two Samsung monitors from a giveaway pile. Like a dog with a bone, I brought them to my work desk back home.

TL;DR Key Takeaways : The Mac Virtual Display feature creates additional screen space without requiring a physical monitor, enhancing productivity and focus when paired with Immersive Mode.