What should i do with ‘is mouse button down’?
Or is there any other blue print ways? Anything is okay.
I want to run my character like the ones in common quarter view games.
You can just turn the sprinting on with a mouse click. When they click again, turn it off. Use a FlipFlop node 
or you could use the on released pin to stop the running. so on pressed begin sprint, on released end sprint.
Thank you for answers! I’ll try to script it.