The actual display engine is configured via an ASCII file called disp.dat. A default disp.dat file exists in the general oracdr distribution (ORAC_DIR). Additionally a default disp.dat is provided by your instrument scientist or software engineer in the appropriate calibration directory (ORAC_DATA_CAL)
When you invoke oracdr, the pipeline checks in ORAC_DATA_OUT for an existing disp.dat. If it does not find one, it copies in the one from ORAC_DATA_CAL, or if that doesn't exist, the one from ORAC_DIR. In all of those scenarios you end up with a file in ORAC_DATA_OUT which is what is used by the display system. Any configuration changes have to be reflected in the file.
ORAC-DR: Overview and General Introduction