Add layers to your Visio drawing to manage objects and stay organized.
See which layers a shape is assigned to
Select a shape.
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Select Home > Layers > Assign to Layer.
The assigned layers are selected in the list.
Show or hide a layer
Select Home > Layers > Layer Properties.
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Do one of the following.
To show a layer, select its Visible check box.
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To hide a layer, clear its Visible check box.
Note: Shapes are visible if any of the layers they’re assigned to are visible.
Assign shapes to layers
In some templates, certain shapes are assigned automatically to predefined layers.
Select a shape.
Select Home > Layers >Assign to Layer.
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Select the layers you want to assign the shape to, and select OK.
Tip: Shapes can be assigned to more than one layer. Organize them in both broad and specific layers, depending on your needs.
Make a layer active
Shapes can be assigned to more than one layer. Organize them in both broad and specific layers, depending on your needs.
Select Home > Layers > Layer Properties.
For the layer you want to make active, select its Active check box.
Create a layer
Select Home > Layers > Layer Properties.
Select New.
Type a name for the layer, and select OK.
Delete a layer
If shapes are assigned to the layer, assign them to a different layer.
Select Home > Layers > Layer Properties.
Select the layer, and select Remove.
Select Yes.
Source: Microsoft