I am trying to call the level blueprint using blueprint interfaces: Implementing Blueprint Interfaces | Unreal Engine Documentation, my mainMenu level is not a streaming level how can I get a reference to it?
I believe that you shouldnt refer to your level from any other BPs. I guess its much better to refer other BPs FROM your level BP and also you can use event dispatchers. Why do you want to get a ref to your level?
I would use event dispatchers. You can bind them to an event in your level BP.
I dont believe there is ever reason to have to get a reference to your LevelBP. There is usually always a better solution to what you are trying to achieve.
Perhaps if you explained what you are attempting to do, we may be able to suggest an alternative solution.