Google Sheets: Number Format option of horizontal axis labels in a histogram

I would like to change the number format of the horizontal axis labels of a histogram. Some tutorials mention that this should work, e.g.

• New chart text and number formatting options in Sheets
• How To☝️ Change Axis Scales In A Google Sheets Chart

However, the option to change the number format seems to be gone, see the following screenshot:

Is it possible that Google removed that feature? And/or can this be done differently?

Thanks for your help!