Unless you need the volumetric shape to be affected by shadows (in that something can enter the beam and cast a shadows within it) then I’d just use a mesh to represent the beam: Fog Sheet and Light Beams | Unreal Engine Documentation
Unless you need the volumetric shape to be affected by shadows (in that something can enter the beam and cast a shadows within it) then I’d just use a mesh to represent the beam: Fog Sheet and Light Beams | Unreal Engine Documentation