Display Overrides setting
The "display override" option, listed in the Reference Dialog Box, controls how reference display, locate, snap, raster reference display, and level view display (not global display or global freeze) are handled for nested reference files. So for nested reference files, in the reference dialog box, the on/off of the display of the reference, the on/off of the reference locate and the on/off of the reference snap are controlled according to the "display override" option. In addition it also controls the raster reference display of rasters attached through the nested reference file and level view display (not global display or global freeze) of the nested reference files.
-On/off of the display of the reference
-On/off of the reference locate
-On/off of the reference snap
-Raster reference display
-Level view display