It is better to modify the built in styles.
If you want Frank Ruehl Hofshi as the main font then right click Default Paragraph Style, select Edit Style and change the font to that, possibly change the font size but nothing else. OK. Do not use Default Paragraph Style in your work, it is there only to set the starting conditions for other paragraph styles.
All the paragraph styles, except Heading and it’s children, will inherit the font.
If you look at the paragraph styles in the sidebar when they are listed in hierarchical order, you can see what inherits from what style
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Body Text is intended to be the paragraph style for the main body of text. It is the next style after all the Headings and its keyboard shortcut is Ctrl+0
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To change the font for all headings, right click Heading paragraph style and change the font there. Do not change the size there and do not use Heading paragraph style in your document.
You can set Heading n font sizes individually in the heading level by font size or by percentage of Heading font size.
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The AutoText might be better done as text only so it can pick up the paragraph style.