Most people just hide that mesh and trust me we have had lengthy conversations about Axis Orientation over here. In UE4 with almost every asset include the default mannequin rigs y is forward. When you make blueprints and have characters move “forward” they do so in the x posistive axis. BUT for assets when you import them they should be facing the Y posistive axis. We dont know why Epic does it like this but every asset is in unreal, on the market and the default mannequin rig character in the asset viewer it is facing y +. So that’s why we went with that