Hello,
ImagePaddding couldn't cut the left blank of the GraphicsGrid result in MMA 13.3. For example,
a = Plot[Sin[x], {x, 5, 10}, ImageSize -> 5/2.54*100];
b = GraphicsGrid[{{a, a}}, ImageSize -> 10/2.54*100, Frame -> True, ImagePadding -> {{-20, -0}, {0, 0}}]
Will output: 
If export this output to a PDF file, we will get another new figure:
This time, not only the left blank was not changed, neither the right side of the figure. Is it a bug? Or I did it wrong?
