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It can be helpful to make one or more meshes partially transparent; this can be achieved using the opacity spinner on the 3-D Panel, which ranges from an opacity of zero (fully transparent and invisible) to an opacity of one (fully opaque; the default).
The opacity setting affects the mesh in the perspective view and in the camera view only if the OpenGL camera view is used. See View/OpenGL Camera View and the preference Start with OpenGL camera view. The OpenGL camera view is the default on macOS and Linux.
Note that while in an ideal world the opacity setting would simulate turning a solid mesh into an attenuating solid, in reality opacity is simulated using some fast but surface-based alpha compositing features in OpenGL. Depending on the situation, including other objects in the scene, the transparent view may differ substantially from what a true attenuating solid would produce, but generally the effect generated should be quite satisfactory for helping understand the scene.
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