UserAgent: Mozilla/5.0 (X11; CrOS x86_64 9901.54.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.74 Safari/537.36

Steps to reproduce the problem:
(1)Open chrome://settings
(2)Go to appearance and click on 'Customize Fonts'
(3)There is no 'Set to default' button.

What is the expected behavior?
The 'Font Size' option should have a button to reset to the default settings but it does not exist.

What went wrong?
There is a bar to modify the font size settings but there is no information on how the default settings should be and there is not 'Set to default' button.

Did this work before? N/A 

Chrome version: 62.0.3202.74  Channel: n/a
OS Version: 9901.54.0
Flash Version: Shockwave Flash 27.0 r0

This request would help many users to have a straight point on this matter.