Changing the Orientation of Legend

Mix.install([
  {:plotly_ex, "~> 0.3"},
  {:kino, "~> 0.18"}
])

Section

Set legend.orientation: "h" to display legend items horizontally. This is the same property shown in the Horizontal Legend subsection but presented here in the general Legend context.

alias Plotly.{Figure, Scatter}

Figure.new()
|> Figure.add_trace(Scatter.new(x: [1, 2, 3], y: [1, 3, 2], name: "A", mode: "lines"))
|> Figure.add_trace(Scatter.new(x: [1, 2, 3], y: [3, 2, 1], name: "B", mode: "lines"))
|> Figure.add_trace(Scatter.new(x: [1, 2, 3], y: [2, 1, 3], name: "C", mode: "lines"))
|> Figure.update_layout(
  title: "Horizontal Legend",
  legend: %{orientation: "h", yanchor: "bottom", y: 1.02, xanchor: "right", x: 1}
)
|> Plotly.show()