'Fonts & Colors' not showing under Settings in mac Mail

Hi guys, I'm using an M2 macbook with up-to-date OS... want to increase the default font size from 12pt (which is tiny)on my Mac Mail, however when I google how, it says go to 'fonts & colors' under Mail settings... I do this but there is simply NO fonts & colors option showing under Mail Settings... anyone think of any reason why not?

Ps thought it might be hidden under 'preferences' or some other subhead, but couldn't find anything like that; any suggestions much appreciated!

thanks

AShley