If you don't want to pay for an app like DisplayFusion Pro, then Dual Monitor Tools may be the app you're looking for. Conceptually, this tool is very similar to DisplayFusion, but not as in-depth.

4. Keep the Laptop Closed If you have two monitors, you can run your laptop with the lid closed.In Windows, search for the word "lid" from the Start menu. Click Change what closing the lid does to ...

They then often opt for a dual monitor setup or even a multi-monitor setup. However, when you use a dual monitor setup, it is quite difficult to use a single wallpaper on both of the monitors.