Some of the bodies are translucent in multibody part
SolutionInactive design bodies in multi-body documents are use the opacity.
From Solid Edge option this can be turned off by unchecking "Dim surrounding components during in-place edit and inactive design bodies in multi-body documents. Inactive design bodies use the opacity setting plus 50%."
When you set this option, you can also use the Opacity slider to control the translucency
This option is available in Solid Edge Options-View tab.