Mesh scale too big for collision

Hello there,
I have a Skeletal mesh where i want to add collision on its physics asset. The problem is, that i have modeled/rigged/animated the character myself and forgot to set the correct scale in Blender(because UE has a different scale). I can’t change the scale now because it would break the whole character(blender limitations).
Now my problem is that whenever i add shape to my characters physics asset that i want as collision it is super tiny in the editor but huge in the world(I scaled the Mesh down in the Pawn i use it in).

Is there any way to maybe scale the mesh itself down, so its smaller in the skeletal Mesh/Physics asset ?

Thanks!