To delete a layer that contains objects:
Select one Layer at a time via the Layer Database and click the Delete button. Read through the warning and use the Check Layer Contents button to ensure that this layer does not contain anything you do not wish to be deleted.
It is especially important to check if this layer contains Groups: while you may Undo the layer deletion, you may not notice the removal of objects that are on layers that are hidden if those objects are part of a Group that exists on the layer being deleted. (For more information about how Groups work in Vivien, please see the Basic Application Rules section of Vivien Help.) When you are ready to proceed, click OK and then provide final confirmation for the deletion.