Using layers
In complex diagrams, you can use layers to separate or group objects. You then use the layers to control the visibility of objects within the layer and the order in which these groups of objects appear when there is overlap.
You can also create dynamic layers (see Dynamic layers).
1. 
button. The Layers panel opens.
2. To add a new layer, at the bottom of the Layers pane, click the Add Layers 
button. The new layer is inserted above the other ones.
3. To insert a new object to a layer, select the layers and then insert the object in your diagram. The new object is automatically inserted into the selected layer.
Tip: When you click an object in your diagram, the layer it belongs to is highlighted in the Layers pane.
4. To move an object from one layer to another, right-click the object and choose Send To > name of the layer.
5. To rename a layer, double- click the layer name, type the new name and press Enter on your keyboard.
6. To change the order of a layer (its z-index), click the layer selector 
and drag it to the desired order. This controls which objects are in the front and which ones are in the back.
7. To hide a layer, select the layer and click the Visible 
button. The layer is no longer visible and the icon is grayed out. Click again to show the layer.
8. To add interactivity to an object in layer, click Link layer 
For more information, see Adding dynamic layers.
9. To lock a layer so that objects in the layer can't be selected or moved, click the lock 
button for that layer. The icon changes to 
to indicate that the layer is locked. Click again to unlock the layer. Locking layers is useful when you need to move one layer while leaving the other(s) in place.
10. To duplicate a layer, select the layer and, at the bottom of the Layers pane, click the Duplicate 
button.
11. To delete a layer, click the Delete 
icon.
