how can I select local library as active library

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To select a local library as the active library, the local library must be added to the footprint library table. Using footprint library tables are fairly well document The CvPcb and Pcbnew reference manuals. When you create a new library from either an existing library or an exiting footprint, the new library is not automatically added to the footprint library table. You must manually add it yourself. The reasoning behind this behavior is it is impossible to know if the library you just created is part of the current project or if you are just creating libraries for use outside the current project.