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

https://dimensionzhub.com/how-much-space-does-a-gaming-setup-really-need/

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