My careless, for total label in stacked bar chart, this is a new feature in power bi.
If your chart has a field in the Legend (for stacked bar/column) or Column Series (for combo) field well, you can enable total labels in its card in the formatting pane
Thanks for your reply @v-lili6-msft . Shouldn't it be treated as a defect? I read the blog, nowhere it is mentioned that it will not work if we have just one legend.
Yes, it is by design. We are reconsidering removing the limitation, but if user wants "total" outside end, just set the regular data labels to outside-end as well.
First, this just is a workaround for your requirement.
Second, in formatting pane, after putting legend again, it is resetting the position to "Auto", but in the visual, this will work as "Outside-end" when you filter legend field to one value.