First of all: great template with a lot of options!
I only have one problem. When I change the default font in: Dazzling options: Typo
It does not change the font in the secondary widget. I used a text widget en included the text in <p>, but still the font does not change.
Should I use the custom CSS or a child theme?
Ofcourse I mean: the secondary sidebar, the H1 post and the header text.
I hope you are well today and thank you for your question.
That theme option only changes the font of post content.
To change the font of text widget content try adding the following CSS code in the Custom CSS option of your theme on the below path.
Admin Area -> Appearance -> Customize -> Dazzling Options -> Other -> Custom CSS