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

https://holdenssplendiddigests.zenbloomer.com/posts/gaming-setup-ergonomics-basics-i-can-do-in-10-minutes

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