My static mesh doesn't rotate

Hello,
I’m new to unreal and i’m attacking the physics.

I follow some tutorials and get this throwable knife but when i drag my Static Mesh on the DefaultSceneRoot in my blueprint, my SM get back to his inital position, he get back vertical and i want hit horizontal.

I set the position of my knife with and arrow linked on the camera to aim.
And get the location of the SpawnActor with my arrow.




I don’t know where i have to go to change that.
If someone has an issue i’ll be thankful.