Originally posted by Zhi Kang Shao
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To be specific, it has to do with the way Steam's .dll links to the engine/project's process. Using PIE, the engine does NOT create an additional process and therefore Steam will assume the entire UE is your actual game (as a consequence, it will enable the overlay inside the editor itself). Standalone simply creates a new process and Steam is able to act as intended.
Therefore, it's definitely possible to link the editor as a game (a customer actually works that way when he designs user interfaces), but without modifying Valve's code (which is not only unavailable, but also definitely illegal to modify), it's not possible to make PIE work with Steam the same way standalone does.
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