For each drawing dimension and annotation type, you can specify document-level line thickness and style. You can override document-level line thickness and style settings for individual annotation and dimension elements when you create or edit them.
When setting line thickness, you can customize the thickness by selecting
Custom size from the thickness list and typing a value.
Overriding Document-Level Line Thickness and Style
You can override document-level leader and frame thickness and style settings for individual annotations or dimensions in a drawing. To override these settings, select the entity and clear Use document display in the PropertyManager.