I’m having trouble changing the font size of my blogs especially mobile. When I go to the editor-post it changes the font for that blog but it isn’t applying the changes to all of them. Only some. Any ideas?
@Will_Baldwin To customise the font size for all posts, head into the site editor> Blog Pages> Post Page> Select the widget> Settings> Design> Text style and color.
It should look something similar to this 
Good luck!
Is there a way to adjust the line height of the text? The line height from the regular text theme window isn’t applying on the blog posts.