Layer Filters

A layer filter is a subset of layers that can be displayed together.

It is possible to organize layers into groups and to manage layers belonging to a group together. You can use the layer filters to display:

• all layers,
• the used layers, or
• you can create your own layer filter groups.

Options for layer groups are on the right side of the Layer Properties Management dialog.

Creating new filter
Click on the New filter button to create a new layer group called ‘New Group’. You can give the layer group a unique name by right-clicking the name of the new layer group and selecting Rename.

Add layers to a filter
Select one or more layers, then hold down the left mouse button and drag them over a filter, and then release the mouse button. The number of layers in the layer group is shown in parentheses after it.

Display filters
Select a layer group from the Filters list, and only the layers in that group appear on the left side of the dialog box. The list that appears can be further narrowed by turning on the Show visible layers only checkbox.
The Filters list has two built-in layer groups: All Layers group displays all layers  and selecting the Used Layers will display only layers that contain items, regardless of the status of the Used Layers' visibility.

Operations with filters
By right-clicking on the name of a layer group, you can use the pop-up menu to change the settings of all the layers in the group at the same time: you can show or hide them at the same time. you can lock or unlock all layers in the group.

Remove layers from a filter
Select an item from the Filters list and only the layers in that group appear on the left side of the dialog box. Select one or more layers, and then press Delete from Group. These layers were then only removed from the layer group and are still available if you select the All layers group. When you select All Layers and Used Layers, the Delete from Group button is grayed out and cannot be clicked.

Delete filter
Select an item from the Filters list and click Delete in the upper-right corner of the dialog box. At this point, only the layer group is deleted, and the layers in it are still available. Select the All Layers filter.