Hi Chris,
The deformation that you get in Response Spectrum is the maximum response that you obtain when you provide the Spectrum load. The deformation in Static Structural Analysis is the normal state of the model (as per my understanding) - due to which the mode shapes will vary. We cannot compare these two deformation results.
I would suggest you refer to this video on how to perform Response Spectrum Analysis -
https://youtu.be/5DYMvfEUJNc
Cheers,
Surya
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