If you're using Catalina on a Mac, then you need to wait until Apple and/or Adobe figure this out. It seems to be related to the "hidden" partitions that Apple have introduced with the Catalina OS.
If you're not using Catalina, then I don't really know why it would show 3 times, but there is no way to "edit" that list as far as I know. However, clarifying which version of Lightroom you are using would help. "Lightroom CC" is no longer a valid name for any of the current Lightroom apps, that screenshot you supplied is from the traditional desktop folder-based version, the latest of which is now known as Lightroom Classic. If you're using an older version, do Help>System Info to tell us the exact version that you are using.