We can change the Label of Any dimension or expression from the object properties. If you do not want anything then give a space.
This label is displayed below/ aside the Axes.
If my understanding is correct then the 0 which is appearing at the top of the Bar is the data value..
If you want to remove this then
- Go to object properties
- Go to Expressions tab
- Uncheck the "Values on data points" box present in the middle bottom
- Also since it is the value so it can not be changed
Please let me know if anything else is required.