With Preview On, you get a small preview of the Block you are inserting. One of the issues you can have when working with similarly named blocks is that you can’t tell the difference between them! In the Design Resource Palette menu, there is an option to toggle Preview On and Off.
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Simply put, the Design Resource Palette allows users to drag and drop different drawing contents in to their drawing. Have you heard of the Design Resource Palette in DraftSight 2018? If not, let me give you a brief introduction to it and how it can help you manage your Blocks.