Tools > X-Ray Mode
Displays non-selected objects in a semi-transparent mode so that you can more easily examine the selected objects, their parts, and connections. Select one or more objects in the Main view, and then activate X-Ray Mode so that the selected objects stand out as a focal point in the model. Only the selected, opaque objects are visible through the semi-transparent objects. This command is available in both the Tablet and Classic viewing modes.
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Select one or more objects in the Main view.
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Select Tools > X-Ray Mode (Classic mode).
You can also use SHIFT+X or click X-Ray Mode 
from the Common toolbar.
The software displays the selected objects in an opaque manner and the remaining objects become semi-transparent. The example below shows a tank selected in X-Ray Mode.
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Use 3D navigation to move around the model and change view positioning.
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To turn off X-Ray Mode, clear Tools > X-Ray Mode.
