How to change font style of file names in file manager?

Question

How & Where do I change the font style and size of the file names displayed in my file manager.

I have unity tweak tool installed but I am just confused on what is controlling the font display in above image.

EDIT:

I tried playing around with all the options in the below screenshot(Unity Tweak tool) and nothing is working.

Answer 1

Did you have try using gnome-tweak-tool Just run it with Alt+F2 then type gnome-tweak-tool.

if gnome-tweak-tool is not available in your platform you can type sudo apt-get install gnome-tweak-tool in your terminal. Then you're all set