if the definition of the Multi picker Library is:
A "Library of sounds" to build a song with, then the tabs:
1- Styles
2- Real Tracks
3- Real Drums
4) MIDI Super Tracks
5) MIDI Tracks
6) MIDI Soloist
7) Melodist
8) User Tracks
9) Loops
10) MIDI Patches
meet that definition and make a strong browser to sounds.
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SUGGESTION 1: Chord Progression and Chord Variation are "Reference Tools" that would be fit in a horizontal panel associated with the Chord View.
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SUGGESTION 2: Lyrics tab is a Tool more associated with a tool to build dedicated Phrased based Lyrics track in the Track view, or a dedicated Note based Lyrics Track in the Piano Roll and Notation views.
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SUGGESTION 3: Titles tab is a Tool directly associated to the Style Tab workflow and would fit better as a button in the Styles tab.
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SUGGESTION 4: Songs tab should be an "Opening Panel" that brings you into a song like many creative apps on the market.

Studio One (latest version), Win 11 23H2 , i9 -10940X 3.3 GHz, 32GB Mem, a 4K 40" monitor, PreSonus Studio Live III Console as interface/controller. secondarily test on Reaper, Cakewalk, and S1 on Surface Pro 3 Win 10 (latest versions).