I don't know the answer to your question but I would guess that when all bodies are selected, the deformation is plotted at whatever location has the maximum deformation at each frequency. I don't find such a plot very useful.
I always select a vertex to plot the directional or total deformation versus frequency in a Harmonic Response analysis so I know exactly where the amplitude is being reported.
From that FRF plot, I note the frequency of the peak response and request a Stress plot at that frequency so I can see where on the structure the peak stress can be found.
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