Apple has released macOS 10.15.2, and one of the big features in the Music app is the return of the column browser. As I wrote back in August, the loss of the column browser was devastating. It was the best way to navigate large libraries, and without it, it was painful to choose music.
Go to System Preferences > Software Update and get the latest version of macOS. Then, in the Music app, go into Songs view and press Command-B to display the column browser.
This update also fixes the issue where the iTunes Remote app on iOS didn’t work with the Music app.