If the option Boxed is set to be False in Graphics3D, additional white margins may appear as shown in the following figure. Is it possible to remove the useless margins such that the borders touch the contents?

smallarray = 
 With[{L0 = 300, r0 = 50, unitcellsize = 400, origin = {0, 0, 0}, 
   la = 800, ra = 50 },
  Graphics3D[{EdgeForm[None], Yellow, 
    Table[{Cylinder[{{ix*unitcellsize, iy*unitcellsize - L0/2, 
         0}, {ix*unitcellsize, iy*unitcellsize + L0/2, 0}}, r0]}, {ix,
       1, 5}, {iy, 1, 5}], Arrowheads[0.1], Red, 
    Arrow[Tube[{origin, origin + {la, 0, 0}}, ra]], Magenta, 
    Arrow[Tube[{{0, 0, 0}, origin + {0, la, 0}}, ra]], Cyan, 
    Arrow[Tube[{origin, origin + {0, 0, la}}, ra]]}, Boxed -> False, 
   Lighting -> Automatic, ViewPoint -> {Pi, Pi/2, Pi}, 
   ImageSize -> {Automatic, 400}]]