Legend "entrywidth" and "entrywidthmode" parameters appear to be ignored when knitting Rmd to HTML

I'm trying to use plotly to plot several stacked barplots of the same size each. Each barplot has legend elements of increasing size, and I would like to set the dimensions of the legend box, instead of the legend box being the size of the longest legend element. I've found the parameters entrywidth and entrywidthmode and tried using them to set this graphic setting, but the plots look exactly the same independently on what values I use.

The data looks like this:

> head(rel_table_filtered)
                                Class Relative_frequency  Sample
3      Bacteria;Bacteria;Unclassified        0.001547047 ileum_A
4  Bacteria;Bacteria;Actinobacteriota        0.137521410 ileum_A
5      Bacteria;Bacteria;Bacteroidota        0.111055859 ileum_A
8  Bacteria;Bacteria;Desulfobacterota        0.011989613 ileum_A
9        Bacteria;Bacteria;Firmicutes        0.707497652 ileum_A
11   Bacteria;Bacteria;Proteobacteria        0.025857782 ileum_A

The function simplified function I'm using to plot the barplots is the following. Wheter I put 0.9, 0.5, 1/8, etc, on the entrywitdthmode parameter, the plot looks the same. I've also tried with autosize=FALSE and with height and width parameters on the plot_ly function, without success.

fig <- plot_ly(rel_table_filtered, type = "bar", y = ~Sample, x= ~Relative_frequency, color = ~Class, orientation = "h") %>%
    layout( barmode = 'stack', xaxis = list(title = ''), yaxis = list(title = '%'), autosize = T, legend = list(entrywidthmode = "fraction", entrywidth = 0.9), hoverlabel = list(namelength=-1) )

fig

I'm attaching the rel_table_filtered.csv file:
rel_table_filtered.csv

Thanks in advance!

まず、legend entrywidth と entrywidthmode を指定した plot_ly と layout を使って例を再現し、次に Rmd を HTML に knit して、異なるパラメーター値を比較します。添付された rel_table_filtered.csv と、レンダリングされた凡例の挙動を確認してください。knit した出力で、これらのパラメーターによって凡例ボックスの寸法が目に見えて制御されれば完了です。