Her proprietorial attitude towards the office decorations made it clear she thought only she had the right to decide what to display.

proprietorial 是由名词 proprietor（所有者）加上形容词后缀 -ial 构成的形容词。proprietor 来自拉丁语 proprietas（所有权），指"业主、所有者"。 proprietorial 意思是"所有权的、占有欲强的"，形容某人表现出像主人一样的态度，认为自己对某物拥有专属权利。