Unlike standard folders on your hard drive, the Design Library allows for "drag-and-drop" functionality. You can drag a bolt, a washer, or a custom feature pattern directly from the library into your 3D model, instantly applying it with the correct mates and configurations.
If your Design Library tab is empty or showing red "x" icons, you likely need to reinstall the Toolbox data. This is the most common scenario when users search for a fix. download design library solidworks 2020
After downloading, run → Configure → Hardware → Use Purge duplicated configurations to keep the library lightweight. Unlike standard folders on your hard drive, the