Ui widget invisible on game mode blueprint

[civilender]

I want to make a UI widgets, but widgets cannot be selected on game mode blueprint

I made widget classes, but only main widget class can be choosen

	UPROPERTY(EditAnywhere)
	TSubclassOf<class UMainWidget> mainWidget;

	UPROPERTY(EditAnywhere)
	TSubclassOf<class UMenuWidget1> menuWidget1;

	UPROPERTY(EditAnywhere)
	TSubclassOf<class UMenuWidget2> menuWidget2;

and take them on game mode base header file

I want to know how to choose them on blueprint