Planning a gaming setup in limited space starts with a desk about 100 to 120...

https://emiliosbestinsights.rivetgarden.com/posts/what-is-the-smallest-gaming-setup-that-still-feels-good

Planning a gaming setup in limited space starts with a desk about 100 to 120 centimetres wide to fit your monitor and accessories comfortably. Use a monitor arm to free up surface area and create more room for your keyboard and mouse