Histogram percent of total instead of count

I have built and histogram but I am trying to get percent display instead of the default setting count. I have tried a percent of total calculation, but it doesn’t work for my purposes. Is there a way I can do this?

When you are using a histogram, since you are only using one field in the “Value” the default operation is a count and you cannot change the format.
The X-axis is what changes when you select the format (percentage, number, etc.).
If you are trying to get the percentage of a vale in Y-Axis I would suggest you to use the Vertical-Bar chart.
Let me know what is exactly your use case to provide additional feedback.