You should see the layers from referenced files too. Try to change color, line weight, freeze/thaw, etc.You can now apply overrides for color, linetype, lineweight, and plot style to layers in individual layout viewports.And Cad Corner does not warrant that the use of these files will be to the users specifications or error free.The end user shall take responsibility to edit the files to their local standards. THIS PROGRAM WILL DRAW A CABINET GIVEN THE WIDTH, HEIGHT, DEPTH, THICKNESS OF MATERIAL USED, COUNTERTOP OVERHANG, THICKNESS OF COUNTERTOP, AND HEIGHT OF THE SHELF.
When the Auto CAD System Variable XREFOVERRIDE is set to 1, you can change the Color, Linetype, Linewidth, Transparency and Plot Style of objects in the XREF drawing or nested blocks by changing its original layer property in layer palette, in spite of the legacy By Block rule.
Architects will need to use your structure drawings as reference in their drawings.
MEP engineers need architectural drawings as reference.
Now, you can set XREFOVERRIDE to 1 and Auto CAD behaves as if those xref's objects had their properties set to BYLAYER.
You might need to work with engineers from other engineering background.