KLayout 0.30.4 (2025-10-27 8b010d61d) [master] 
KLayout Documentation (Qt 5): Main Index » KLayout User Manual » KLayout Basics » Loading And Saving The Layer Sets
Loading And Saving The Layer Sets
  The visual layer properties can be saved to a file using the "Save
  Layer Properties" function from the "File" menu. This list can be
  loaded again using the "Load Layer Properties" function.