Can not create new Input Custom Event(blueprint>GameMode)

Hello!
I create blueprint>GameMode. I go to EventGraph and create CustomEvent. But I can not add new input, no button. Why?

What if you add a variable, drag a setter on the graph, and then from the input of the setter, drag “backwards” into the custom event node?

It should be there, I just tried it and can create an input without a problem. As far as I know there is no limitation for inputs on a custom event in game mode. Try restarting the editor? Might be a bug?

, It did not help. =(

I created CustomEvent in the other place with Input and copied here, what is it? : D