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

The ability to have two or more external monitors connected to your Mac in Extended Mode is a liberating screen experience, but leads to frustration when each still operates like an independent ...

Setting up dual monitors with XRandR can be a straightforward process once you understand the basics. Here’s a step-by-step guide to help you configure your dual-monitor setup using XRandR ...