Inserting Layers
Drawings in LibreOffice Draw support layers.
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Right-click the layer tab area at the bottom.
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Choose Insert Layer.
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Type a name for the layer in the Name box.
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In the Properties area, set the options for the layer.
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Click OK. The new layer automatically becomes the active layer.
To change the properties of a layer, click the name tab of the layer, and then choose Format - Layer.

You cannot change the name of or delete a predefined LibreOffice Draw layer.