To Remove an Override From a Layer for All Layout Viewports
On a layout, double-click inside a layout viewport to make it the current viewport.
Click Home tab Layers panel Layer Properties. Find
In the Layer Properties Manager, right-click the property override that you want to remove. Property overrides are in columns labeled VP Freeze, VP Color, and so on.
Click Remove Viewport Overrides For [ property name ] In All Viewports.