Enable multiple selections using layout.updatemenus

đź“Š Plotly Python
1

Hello,
I have a plotly chart with multiple traces (dynamic) and I would like to enable users to select multiple traces to display on the chart when the chart is saved as html. I was able to do it in dash using a dropdown menu but I would like to do the same using layout.updatemenus. At the moment I can select a single trace at a time, but when I select another trace the previously selected trace is no longer visible.
Below is the piece of code, please note that the list “waves_name_list” is dynamic and very very long so I cannot cover all the combinations in the dictionary. Is there a way to enable multiple selections using layout.updatemenus?

visible_list = [True]*(3)+['legendonly']*len(waves_name_list)
waves_dict = [dict(label="All",
                     method="update",
                     args=[{"visible": [True]*(3+len(waves_name_list))},])]

for i, w in enumerate(waves_name_list):
    mvisible_list = visible_list.copy()
    mvisible_list[i+3] = True
    mdict = {'label':w,'method':"update",'args':[{"visible": mvisible_list}]}
    waves_dict.append(mdict)


fig.update_layout(updatemenus = list([
    dict(
        buttons=list(waves_dict),
        direction='down',
        showactive=True,
        xanchor='left',
        yanchor='top'
    ),
]))