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 the frozen levels are not displayed and cannot be printed. Global Freeze of levels does not make that level immune from any tools. Tools will still affect the elements on the frozen level even though they are not visible.
When a level is frozen, any cells or references placed on that level will not be displayed, regardless of how levels are used in the elements that make up the cell or reference.
When the Global Freeze is turned ON, the level display is always OFF in the views irrespective of whether the Global Display is ON/OFF. However, if the "Global Freeze" is OFF, level display is ON/OFF depending on whether the Global Display is ON/OFF. Thus you can say that Global Freeze is superior to Global Display
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