I recently changed my blog's font but I'm not really satisfied with the result, so I found a new font for my blog and tried to change but it's not possible. I can only change the title's font, but I can't change the "Description" font.
As you can see, there's a Custom option under the Title section —TÃtulo, in Spanish—, but there isn't a custom option under the Description section —Descripción, in Spanish—, so I'm not able to change the description font, however I was able around one or two weeks ago.
Moreover, I tried changing the font of the default paragraphs but it didn't work; I will thank you if you can help me with this problem.

WE CAN'T CHANGE THE FONT SIZE FOR INDIVIDUAL POSTS. STOP LYING!! IT'S THE SIMPLEST THING POSSIBLE AND YOU CAN'T FIGURE IT OUT
I'm having this same issue. This is the menu that pops up for me - unlike the screenshot you show above, I have nothing underneath "Title" - there is no "Description" (and there is no vertical scroll bar). Help?!?!
Hi Laura,
I see that 'Description' in your site allows to change the font. You can also change the sizes of Title and Description:
Please elaborate on the other issue - changing the font of the default paragraphs. Which paragraphs do you refer to exactly?