Not a new issue, but I though I'd mention it now that the library size issue is resolved.
After resizing the library tab from half-width to full-width, the facet view proportionally gets larger.
The first thing I end up doing is resizing its width, to be able to see more of the library details.

Without breaking any other improvements or other user preference, might there be a way for the facet to use a fixed width?
8.3 SR-3 (8.3.0.0034) on macOS 10.14.3 (18D109)