Layer Management > Concentrate On (Manage Menu)

This command can be used to concentrate on layers by identifying objects that are assigned to the desired layers. To concentrate on layers means to disable all other layers by clearing their attributes "Lock", "Ignore" and "Shade Down", i.e. those layers will be displayed in a gray color, objects assigned to them can usually not be chosen and will not be considered during snap point detection. In addition, the attribute "Output" is cleared, so those layer will neither be printed nor copied to the clipboard.

Choose the objects to whose layers the concentration shall be done. Click on objects to choose them, including objects in locked layers.

After identifying the objects, their layer assignment is determined and all but the affected layers are disabled.