Electrical tab > Settings group > 
Setting files menu > Automatic layer change
on/off
With this function, you can switch automatic layer change on and off. When the automatic layer change is on, the function is highlighted:
When the automatic layer change is on, the symbols are inserted to the layer defined in the settings file in use. If the automatic layer change is off, the symbol is always inserted to the active layer.
Note: This setting only works with arrangement drawings.
This setting can also be activated in the Electrical settings.