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Black screen after launch from outside of unreal

When i finished the project an built it and its goon in play i launched the scene OK but when i try to run it from outside the software ti become black screen , i didn’t change any thing in the default setting , i’m just a beginner

It will be black for a second whilst it loads. Give it a few seconds and it should show your game.

Might be that you are not loading the map correctly. check here Edit Menu->Project Settings->Maps&Modes. You need to make sure you are loading the map you want for game (and editor if you like) otherwise it may well be trying to load a default map with nothing in it. hence the black screen.