Initially, these would come from a linked XIN, but might also come from a DGNLIB with a linked XIN but as standards are developed and refined may eventually reside mostly in a DGNLIB and will usually be reorganized into various folders. Your image appears to show XIN and DGNLIB folders. Expand any of them by the plus sign and it will reveal feature names or more folders. If a feature has more than one type (surface, linear or point) it will also have a plus sign.
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