Always group ( Ctrl+G or Cmd+G ) complex multi-line vectors before importing them into the Art Library. This ensures they drag out onto your workspace as a single cohesive unit.
Because the 2021 art library is no longer bundled with newer versions (v1.4+), LightBurn offers a on their support forum. You can find it by:
To use an item from your library, simply click on the thumbnail in the Art Library panel and drag it onto your workspace, or select it and click . Downloading Pre-Made Art Libraries