Hello, I find GraphicsGrid can only show the first picture's callout. May code
a = ListPointPlot3D[{{1, 2, 3}, {2, 1, 3}, {2, 3, 1}} -> {55, 56, 57},
LabelingFunction -> Callout];b = ListPointPlot3D[{{1, 2, 3}, {2, 1, 3}, {2, 3, 1}} -> {55, 56, 57},
LabelingFunction -> Callout];GraphicsGrid[{{a, b}}, ImageSize -> Full]
The second picture lost callouts. 