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It seems that in depth is like two separate words like
I have studied this subject in some depth.
But in-depth is like one word and an adjective
He has an in-depth knowledge of the subject .
Am I correct? Would you provide more information about their difference?
"In-depth" is an adjective which means comprehensive and precise, while "in depth" is a phrase or idiom which works like an adverb, meaning the same, so as comprehensively and precisely. Examples: An in-depth analysis of the problem. The problem was analysed in depth.
[he did x] more in depth, or would you have to say [he did x] in more depth?