A lot of people don't actually know this, but you can use 2 controllers & 2 monitors (on PC) to achieve 2 full screens while playing splitscreen with a friend! : r/RocketLeague
How to Set Up Multiple Monitors for Your Windows or Mac Computer | WIRED
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How to Set up & Use Dual Monitors on a Windows PC or Mac
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How to Split the Screen in Windows
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How To Set Up Dual Monitors In Windows 10 (2022) - YouTube
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What Are the Benefits of Dual Monitor Setup for Gaming? | BenQ US
Setting up Two Monitors on Your PC - Discount Computer