DRBs contain definitions for individual interface elements, but not full UI layouts.
In DS1 with UDSFM, fade.drb and menu.drb are found in the menu folder. nowloading.drb appears to be unused.
In DSR, fade.drb.dcx and menu.drb.dcx are found in the menu folder. nowloading.drb.dcx, nowloading.drb, fade.drb, and menu.drb are all unused.
The overall structure of DRB and the layouts of some sections are well understood, but the purposes of many values are unknown and some sections cannot be fully parsed and rewritten.
See the section title.