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  • Add those 3 options to the sidebar:

    • Always Show
      Always show the sidebar
    • Smart Hide
      Show sidebar only when we roll the mouse over the left side of the browser
    • Always Hidden
      Never show the sidebar
  • I'd better prefer Vivaldi's solution: an optional narrow (semi hidden) sidebar and/or a quick toggle button on the toolbar. Because in Opera the sidebar is a part of the window and opens not inside the frame.