Virtual joystick is not moving

Hi, I’m trying to add joystick movement for project “Vehicle Game” from ue4 learning.
What I want to do is getting X-axis or Y-axis to control my Vehicle moving forward or right.

I added Left/Right Thumbstick in ProjectSettings - Engine - Input - Axis Mappings.
But Thumbsticks are not moving anyway.

And I also tried “Use Mouse for Touch” and apk file for andriod.
So please help. Thanks.