You can use the Overrides On/Off command to turn layer key overrides on and off for the current layer key style in your drawing. This command is available only if your current layer key style is based on a layer standard and if you have specified layer key overrides. If the layer key overrides are on in the current drawing, a check mark is displayed next to the command name on the menu.
If you turned the layer key overrides on, objects that you create are placed on layers defined by the layer standard definitions and are overridden with the values that you specified. If you turned the layer key overrides off, objects that you create are placed on layers defined by the layer standard.