How to change font size in a bar chart?

[alejandrobarce1]

I remember that there was an option to change the font size of axis, but now I can't find it. I'll attach an image of what I'm talking about:

What's marked in red, is the text I would like to change the font size, as it seems too small and I can't find the way to change it.

[阿泰]

Hello, please check the screenshot—hope this helps!