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This way it only affects the parts that interest you.
You can create a QSS with this code or copy and paste it to the end of the current QSS file.

/* Secuencer =  qtractorTracks */
/* Midi Editor =  qtractorMidiEditorForm */
qtractorTracks QScrollBar:horizontal,
qtractorMidiEditorForm QScrollBar:horizontal {
  height: 0;
}
qtractorTracks QScrollBar:vertical,
qtractorMidiEditorForm QScrollBar:vertical {
  width: 0;
}
qtractorTracks qtractorScrollView QToolButton,
qtractorMidiEditorForm qtractorScrollView QToolButton {
  min-height: 0;
  min-width: 0;
  max-height: 0;
  max-width: 0;
  border: none;
}