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@FabioMosella
Description
Hello
It seems that we cannot modify the title of the hovertemplate when the chart uses a unify hovermode whenever the axis has not a date type.
Here a short example with 2 scatter plots, the first one with a date axis and the second is linear:
import numpy as np
import pandas as pd
from plotly.subplots import make_subplots
dates = pd.date_range("2022-01-01", "2022-03-01")
values = np.random.randint(0, 10, len(dates))
fig = make_subplots(cols=2)
fig.add_scatter(x=dates, y=values, row=1, col=1)
fig.add_scatter(x=values, y=values, mode="markers", row=1, col=2)
fig.update_traces(hovertemplate="%{y}<extra></extra>")
fig.update_xaxes(row=1, col=1, hoverformat=" ")
fig.update_xaxes(row=1, col=2, type="linear", hoverformat=" ")
fig.update_layout(hovermode="x unified")
fig.show()
If you force the second scatter to be a date type, the hovertemplate title is removed with the workaround hoverformat=" ". However, it only works for date axis.
Here some references/related issues:
#4278
https://community.plotly.com/t/customizing-text-on-x-unified-hovering/39440/18
https://community.plotly.com/t/pass-nothing-or-disable-x-axis-hoverformat/67496
plotly version = 5.18.0