Fonts Installed in Windows Do Not Appear in Fonts Preferences Page
Problem
I installed a font in Windows and it does not appear in the list of available fonts in the page (in the Editor section).
Cause
Oxygen JSON Editor is a Java application and Java does not detect fonts that are installed at the user level. This most likely occurred because you installed the font via the Install for me option in Windows.
Solution
Reinstall the font using the Install for all users option in Windows. You will need Administrator privileges to access this option.