Apple Books change library location.

Why is it that after 7 months the Apple Books library is STILL not able to be relocated? I’m forced to use a Mac-mini running Sierra to do all my iPhone updates, backups, and syncing because I can’t use Apple Books on my Catalina MacBook because of the size on my audiobook library! I’ve stopped reporting it as a feature request, and started reporting it as a bug needing to be fixed. My music for my MacBook is all contained on an external hard drive. I have that same hard drive with my audiobook collection on it. If someone has a solve that doesn’t require me to re-edit my audiobook files, please let me know. And this needs to keep getting reported as a bug fix.