<< Click to Display Table of Contents >> Navigation:  Drawing Environment > Ribbon menus > The “Home” tab > The “Layers” panel > Commands in the slide-out panel > Toggle display mode for item designations

Each time the command is executed, the display mode is shifted between fixed and symbolic item designations.

 

In reality this means that either the layers DESIG18 and DESIG25 are turned on, and the layers LABEL18 and LABEL25 off, or the other way around.