You searched for: “claustrophilic
claustrophilic (s) (noun), claustrophilics (pl)
Relating to someone who has a strong preference to be in small places rather than in roomy or spacious areas: Robert was a claustrophilic who definitely wanted to work in enclosed spaces that are big enough for one person so he can do something without other people seeing or hearing him; especially, when he is talking on the phone as he discusses technical issues with customers of his company.