Change Blog's Default Font

Good morning.

Is there a way to change the default font for blog BODY copy?

I tried the Typography panel in the Customizer but could see no controls for body copy ... only ways to change Headings 1, 2, and 3.

When I begin typing a new post, the default font is -apple-system and the point size is 13.

I would like the default font to be Times New Roman, 13 point.

FYI, I am using Advanced Editor Tools (previously TinyMCE Advanced) and Classic Editor ... not Guttenberg.

Thank you.