Change CMS Font Sizes in the WYSIWYG Editor

[Budget101]

I recently updated to 4.2.2 and now the sizes in the WYSIWYG editor have Shrunk.

Specifically Size '3' used to be 16 px and is now 12px. Where do I edit the Font Sizes for the editor itself, As size 3 is now smaller than normal text.

I tried changing the font sizes in the Stylevars but that had no effect on the Font sizes returned when using the CMS articles WYSIWYG editor.

Here's a screenshot of the area I'm trying to fix:

Attachment 151751