Below is the full list of panels available in the left sidebar. The Button column depicts the corresponding tool buttons from the left tool palette.
Button
Panel

Clefs
Treble, Bass, Alto, etc., Octave markers
Treble, Bass, Alto, etc., Octave markers

Key signatures

Time signatures
Simple, Compound, Complex meters
Simple, Compound, Complex meters

Tempo
BPM, Tempo Marking
BPM, Tempo Marking

Rhythmic feels

Tuplets
Duplet, Triplet, Quadruplet, etc.
Duplet, Triplet, Quadruplet, etc.

Notes relationships
Tie, Hammer-on/Pull-off, Glissando, Slide, Bend/Hold/Release
Tie, Hammer-on/Pull-off, Glissando, Slide, Bend/Hold/Release

Playing techniques
Pizzicato, Palm Mute, Let Ring, Tapping, Slapping, Popping
Pizzicato, Palm Mute, Let Ring, Tapping, Slapping, Popping


Bends
Grace note bends, Microtone bends
Grace note bends, Microtone bends


Rhythmic bends
Hold, Release
Hold, Release

Ornament slides

Octave lines

Accents
Staccato, Marcato, Tenuto
Staccato, Marcato, Tenuto

Grace notes
Acciaccatura, Appoggiatura
Acciaccatura, Appoggiatura

Ornaments
Mordent, Turn, Trill
Mordent, Turn, Trill

Tremolos
Measured/Unmeasured tremolos, Multiple staccatos (Divisi Dots), Buzz Roll
Measured/Unmeasured tremolos, Multiple staccatos (Divisi Dots), Buzz Roll

Fermatas

Ghost notes
Ghost, Dead
Ghost, Dead

Harmonics
Natural, A.H., T.H., P.H.
Natural, A.H., T.H., P.H.

Dynamics
ppp, ..., fff, Crescendo, Decrescendo (Diminuendo)
ppp, ..., fff, Crescendo, Decrescendo (Diminuendo)

Stems directions

Strum/Bow directions
Upstroke, Downstroke
Upstroke, Downstroke

Fingering

Pedal marks
Sustain, Soft, Sostenuto, Simile
Sustain, Soft, Sostenuto, Simile

Arpeggios

Beat repeats
Simile mark, Slash repeat
Simile mark, Slash repeat

Bar repeats

Section repetitions

Volta brackets
Alternative endings
Alternative endings

Repeat jumps
Segno, Coda, D.C., D.S., Fine, To Coda
Segno, Coda, D.C., D.S., Fine, To Coda

Section names
Intro, Verse, Chorus, Bridge, Outro, etc.
Intro, Verse, Chorus, Bridge, Outro, etc.

Rehearsal marks
A, B, C, A1, A2, etc.
A, B, C, A1, A2, etc.

Barlines
Single, Double, Final, Thick, Dashed, etc.
Single, Double, Final, Thick, Dashed, etc.

Breaks
System (Line) break, Page break, No break
System (Line) break, Page break, No break