The XDWGFADECTL AutoCAD variable controls the dimming or fading of xrefs. This can be very helpful when working on drawings that include complicated xrefs. Changing the fade value to and from a high number to "show" and "hide" the xref can be faster than unloading the drawing. Sam Lucido's LISP routine toggles the value of this variable quickly. Start by loading the LISP file, then type in the command XFD. If XDWGFADECTL is set to 0 (meaning no fade), then it will be set to 80. If XDWGFADECTL is not zero, then the value will be saved and then changed to zero. Type in XFD to toggle to the previous setting, and feel free to adjust the 80 value in the code to meet your preferences.
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