Working With Layers on Apache OpenOffice Draw
Below the working area on a Draw document, it is possible to see by default three "tabs"
Each tab represent a "Layer" on the drawing. Layers are a way to group different object inserted to gain more control of all the elements. For example, it is possible to associate all dimension lines to the "Dimension Lines" layer while keeping the main elements on the "Layout" layer. Or even create a new layer called, for example, "guiding lines" where simple geometrical objects are inserted to guide us on the building of our drawing.
The advantage of working this way is that it is possible to make a layer "invisible" with a simple right click over it, so every element on that layer will be automatically hidden from the resulting drawing. It is also possible to choose that one particular layer do not print or that their elements are locked so they cannot be edited. All those properties are available with a simple right click over the layer name → Modify layer
Associating Objects With a Particular Layer
The easiest way to associate an object to a layer, is to select that layer before inserting the object. If the object is already there, you need to cut the object by selecting it and issuing+ , select the desired layer and then paste the object with + .