Drack

I am new to this forum thing, I need help to reduce the font size of my chat. As you can see in the first image the letters are too big and below are the default ones I want that when I use the "archetype" theme it will look like the default one. It only looks small when I use the default theme, but when I use the archetype, the letters look very big if anyone knows how to fix it I would greatly appreciate it sorry for my bad English.