Sometimes, users accidentally delete the default library. You do not need a full reinstall. Instead, download the default structure from SolidWorks’ admin image.
Even in a stable release like 2020, problems occur. Here is how to fix them: download design library solidworks 2020
For downloaded parts, add custom properties (Material, Cost, Part Number) by right-clicking the file in the Design Library → Properties . This populates your BOM tables automatically. Sometimes, users accidentally delete the default library
For specific parts or user-generated content, use the integrated 3D ContentCentral link directly inside the Design Library tab. Third-Party Libraries: Sites like add custom properties (Material
To save a sketch or feature as a reusable library part: