I have a complex layer (group) program, with few icons I can manage dozens of layers, for example in cruise ships field:
Group name
"COM_" ;Common
"LAY_" ;LAY-out
"LAY_TOP_" ;LAY-out TOP/wall
"LAY_WLL_" ;LAY-out WaLL
"LAY_CEI_" ;LAY-out CEIling
"FDT_" ;FounDaTions
"PRC_" ;PReCoordinations
"LNG_" ;LiNinG
"CLN_" ;CeiLiNg
"FRE_" ;FREon scheme
"ELE_" ;ELEctric scheme
...
changing layer group automatically can change the icons of the layers related to it for each group each layer can have its own name linetype color, with the activation of a group of layers (topic) and I can establish the visibility of the others layers and if it is necessary change the color and/or line type.
The commands Hatch, Point, Dimxxx, Text, Ray, Xline, Leader, Attdefs will activate the Layer assigned to these entities in the current group...
Line, Pline, Circle, Arc, etc. have a special floating layer "Draw" in the current group…
To draw something in a non-normalized layer you need manually deactivate the automation so all the designers automatically draw on the same layers and with the same settings.