...
Refresh: Refresh the Layer manager display.
New Layer Filter: Creates a new Layer filter. Assign a name to the filter then setup the filter in the Layer Filters dialog.
Edit Filter Parameters: Open the layer filter currently selected in the tree in the Layer Filters dialog.
Edit Layer Sets: Opens the Layer Set dialog to create and edit layer sets.
New Layer Template: Creates a new layer template from the currently selected layers.
New Layer: Creates a new layer. The default name will include a prefix by default, but the name can be changed.
Delete Layer: See Snap Modes.
Activate: Sets the currently selected layer (only one) as the active layer. This will effect any currently active drawing tool or currently selected object.
Select By: Selects all objects on the currently selected layers.
Edit Properties: Opens that layer page of the Drawing Options.
Visible/Invisible All: If any layer is invisible all layers are made visible. If all layers are visible they are all made invisible.
Invert Visibility: Turns all visible layers invisible, and all invisible layers visible.
Exclusive Visible: Makes only the currently selected layers visible, all other become visible.
Lock/Unlock All: If any layer is unlocked all layers are locked. If all layers are locked they are all unlocked.
Invert Lock:
Exclusive Lock: Makes only the currently selected layers locked, all other become unlocked.
Layer Prefix: By default, the layers are named "Layer 1, Layer 2," etc. You can change or remove the prefix. The @ symbol is a placeholder for the automatic layer number.
...