I created a main menu like in the tutorial in Unreal Engine. Everything is exactly the same but when i click start game... nothing happens! I set a node: open level-> Level_1 -> remove from parent

[Khol76]

Got the same issue and verify theses couple things…
In your project settings, Maps&modes, game default map should be the one for mainmenu.
In your mainmenu level, (under world settings) you need to select a different gamemode BP then your level.(HUD class)
Make sure the starting level is exactly spelled the same!

Hope this helps