XDWGFADECTL command
Controls the dimming for all DWG xref objects.
The valid XDWGFADECTL system variable value is between -90 and 90. When XDWGFADECTL is set to a negative value, the Xref Fading feature is not turned on, but the setting is stored.
0 | DWG xref objects are not faded. |
>0 | When the value is positive, controls the percent of fading up to 90 percent. |
<0 | When the value is negative, xref objects are not faded, but the value is saved for switching to that value by changing the sign. |
or options command > display tab > fade control external reference in the lower right corner