What is the name of the node?
It’s just a boolean variable called ‘Playing’.
You gave us nothing to work with so you got a generic answer 
What was suggested was a boolean flag that you create and update yourself as you see fit:
You can get / set it so you know what is its current state.
that’s too much
On the contrary; In short - no clue what you’re doing and need ;p. Consider providing more info.
Thanks. I didn’t express it clearly. The situation is like this. When I was doing UMG, I encountered a problem, that is, I wanted to use “get all actors of class”, but I found that it had a limitation of “world context object”. I can only choose to get actors under “game world” or “editor world”. I want to solve this limitation
I think it will work for this…
This method is OK, but there is a new problem that this node needs to be made in each scene
I don’t know a better one, I’m afraid. Editor scripting is just very different from run time.