R语言Plotly柱状图如何将底部注释设置为左对齐

直接在annotations配置列表中新增align = "left"参数即可。
Plotly的注释组件默认align属性值为center，因此你用\n拆分的多行注释会默认以锚点为中心居中排布，显式设置对齐属性为左对齐就能解决问题。

修改后完整代码 #

library(plotly)
library(reshape2)
library(dplyr)

plot_ly(
  x = c("giraffes*", "whale**", "monkeys"),
  y = c(20, 14, 23),
  name = "SF Zoo",
  type = "bar"
) |> 
  layout(annotations = 
           list(
                x = 0, 
                y =-0.131, 
                text = "Note: * The tallest animal,Unsurprisingly, the giraffe is the world's tallest living animal by standing height. Male giraffes can measure up to 6 meters or almost 20 feet, but with a height of up to 5.2 meters or 17 feet \n Note: ** Тhe longest animal" ,
                showarrow = FALSE, 
                xref='paper', 
                yref='paper',
                align = "left" # 配置注释文本左对齐
                )
  )

可选优化 #

当前你设置的x=0对应绘图区域的最左边缘，左对齐后文本会紧贴边缘，如果觉得视觉上太挤，可以把x值微调为0.01~0.03，给注释左侧留出少量留白。

内容的提问来源于stack exchange，提问作者silent_hunter