XrefLayers is a single-window tool to manage XREF insert layers: create per-XREF target layers, assign inserts to target layers, force all XREFs onto one existing layer, and zoom to a selected XREF extents.

Xref → Own Layer Manager This AutoLISP routine scans the current drawing for attached xrefs, shows them in a dialog with a checkbox and a per xref layer popup, and lets the user create or assign layers for those xrefs in one place. The dialog is generated dynamically so it always shows the exact xrefs that exist in the drawing at that moment.