Level Display dialog in MicroStation is used to turn on and turn off levels in a model. This dialog contains the display control options (on/off switches): View Display, Global Display and Global Freeze as shown in below image. View Display If you are in "View Display" mode, changes in the level display affect the chosen (selected) view in the active model. This means that when you select/deselect a level in the level display dialog, it will turn on/off that level in the selected view only. It doesn't affect other views. Thus it has a local effect. Global Display If you are in "Global Display" mode, changes in the level display affect all views in all models in the open file. This means that when you select/deselect a level in the level display dialog, it will turn on/off that level in all the open views. Thus it has a global effect. Global Freeze Changes in the level display affect all views in all models in the open file. When Global Freeze is on, elements on...