I created a histogram and I want to change the number of bins.

The official tutorials and official website provide instructions to select the axis and then Format Axis to change number of bins

as described in the screenshot below

format bins intended.png

However, what I get when I try to do the same thing is in the screenshot below

format bins actual.PNG

no options to set the number of bins.

I am using the official Microsoft Data Analysis add-in.

How do I get the option to set number of bins as in the first screenshot?