All levels are greyed out when choosing Global Display in Level Display dialog
Changing Element Display Order
Elements on reference levels not displayed in master file
How to change the level display in different viewports in a DWG file?
How to turn a Level Off with the Off By Element method in V8?
Replacing reference remain levels
Turn off all Levels with Function Key
Turns off levels in level display
Undo command "off by element"
V7 Workmode - Level Overrides to use a custom linestyle
What happened to the toggles for the different views in Level display?
What is the difference between Global Freeze and Global Display?