When i launch my project on desktop i see nothing only dark screen but works fine when i hit play button. Could some one help me?

when i launch my project i am getting only dark screen but my project works fine when i hit play button. what might be the problem?

Well, what is the level that you have opened when the editor starts?
Can you provide screenshots of the level and the World Outliner?
If there is nothing in the World Outliner, then the level will be dark and probably only used to open widgets and/or load other levels.

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i dont know where is the problem?

Well there seems to be no background in the level here. Try adding an Atmospheric Fog to see what I mean. Maybe you are adding the Atmospheric fog in Begin Play and that’s why you don’t see any background from the Editor…?

Oh and next time, if you provide a screenshot or a clearer explanation other than “only dark screen” makes us understand the problem more. What I thought you meant in your original post is that the level was completely black.

sorry for vague question. Above is the pic of my project in editor. when i hit play button i see axactly the same thing as above pic but when i launch my project i get only dark screen. when i launch my project screen should display as above pic. what should i do for that?

Go to Edit > Project Settings > Maps and Modes, and make sure that the Default Level and the Level at Startup are set to this level you want to open. DDoes this issue still occurs after that?