Start by measuring your available space—aim for a desk 100 to 120 centimetres...

https://seo.edu.rs/blog/how-much-space-do-i-need-just-to-sit-comfortably-at-my-desk-11216

Start by measuring your available space—aim for a desk 100 to 120 centimetres wide to fit your gear comfortably. Use a monitor arm to free up desk surface and create more room for your keyboard and mouse