How to make logic for main menu?

Wonderful! Thank you. But how can I check if it works? I tried to play game as standalone process but there is no my menu.
My event to show menu in main widget bp:
image
My event in game instance:


I thought the problem may be there is no instance of my main widget bp, but I tried to create widget in game instance:

still no result.
Update: debug shows me, that cast failed when I’m trying to cast to main_hud. But I don’t understand why there is no start menu when I’m creating it in game instance?