A plugin that helps you to switch the base fonts that Unreal Engine uses. Is able to manipulate all the English-localized default fonts, and comes with its own category in the Edit > Editor Preferences page of the settings.

Can accept and use any '.ttf' style font. You can download a bunch of them from google fonts or various other websites, and you can transform '.otf' font types into '.ttf' through various free file alteration websites.

Just put whatever fonts you want to use into the TempFonts folder in your desired folderpath. (NOTE: the filepath in the input box will be the parent directory of where you want the file. if a TempFonts folder does not exist within that filepath, a new folder with that name will be created there.)