Configuration button from the File Toolbar or Tools menu, and navigating to the Lidar section. These settings are also available from the 
Filter button of the LiDAR Toolbar. The Lidar section in the Configuration dialog controls the display and interpretation of Lidar classes and Return Types.
Access the Lidar Configuration by selecting the Configuration button from the File Toolbar or Tools menu, and navigating to the Lidar section. These settings are also available from the Filter button of the LiDAR Toolbar.
Turn the display of Lidar classes on or off.
Context Menu
Enable All / Disable All
Use these buttons to quickly select or deselect all Lidar Classifications to make all visible or all filtered.
Turn the display of Return Types on or off. These settings apply to 3D point clouds that contain multiple returns, such as traditional aerial lidar data.
This setting will modify the return count (RETURN_CNT) and return number (RETURN_NUM) attributes of points when a pointfrom the same pulse has been marked as deleted.
When a point is undeleted, the original return number and return counts will be restored for the related points.
This will turn all Lidar classes and Return Types on so they are visible, and reset all class names to the default ASPRS classification names.