Headings, lists, callouts, sidebars: making non-fiction interiors work

By Tracy Atkins, founder of BookDesigner.ai and BookDesignTemplates.com · 15+ years of print files, 70,000+ authors · Updated October 9, 2026

Why non-fiction interiors are harder than novels

A novel is mostly one paragraph style running for three hundred pages. A non-fiction book asks the layout to do more work: it has to signal structure. Readers skim non-fiction. They flip to a chapter looking for one idea, they scan headings to decide whether a section applies to them, and they expect a list to look like a list and a sidebar to look like a sidebar. When those signals are inconsistent, a reader has to work harder to find what they need, and that friction shows up as returns and lukewarm reviews even when the writing itself is good.

The fix is not more design. It is more discipline: a small, fixed set of styles used the same way every time they appear.

Heading hierarchy: two to three levels, no more

Most non-fiction needs a chapter title, a first-level subhead (an A-head) for major sections within a chapter, and occasionally a second-level subhead (a B-head) for a subsection within that. That is the practical ceiling. Books that add a third or fourth subhead level almost always end up with headings that look nearly identical to each other, which defeats the purpose of having a hierarchy at all.

• Chapter title: largest, most distinct, usually with generous space above it.
• A-head: clearly smaller than the chapter title, often bold, sometimes a different type style (small caps, a different weight) so it reads as one step down.
• B-head: smaller still, or the same size as body text but bold or italic and run into the paragraph. Reserve this level for books that genuinely need it, workbooks and reference-heavy titles more than narrative non-fiction.

Whatever levels you choose, style them exactly the same way every single time. If your first A-head is 14pt bold with 24pt of space above it, every A-head in the book needs that same spacing, size, and weight. Readers build an unconscious map of your hierarchy within the first chapter; a heading that suddenly looks different two-thirds through the book reads as a mistake, not a stylistic choice.

Lists: hanging indents, not decoration

A list should look like a list. The most common list problem in self-formatted manuscripts is a wrapped second line that falls back under the bullet or number instead of aligning under the first word of the item. That is a hanging-indent problem: the bullet or number sits outside the text block in a small indent of its own, and every line of that item, including wrapped lines, aligns to the same left position.

• Numbered lists: use hanging indents so the numeral sits flush left and the text block starts at a consistent tab stop regardless of whether the number is one digit or two.
• Bulleted lists: keep the bullet character simple and consistent throughout the book; avoid switching bullet styles between chapters.
• Spacing: space between list items should be tighter than the space between ordinary paragraphs, so the list reads as one connected unit rather than a series of separate mini-paragraphs.

Nested lists (a sub-list under a list item) are worth using sparingly in print. They work fine on a screen where width is flexible, but on a narrow paperback trim a second indent level can eat into the line length so much that individual lines wrap awkwardly. If a list needs two levels, consider whether it would read better broken into two separate lists instead.

Callout boxes: rules beat tints in black and white

A callout box, a tip, a warning, a "key takeaway" box, gives non-fiction some visual rest and highlights material a skimming reader shouldn't miss. The design question is how to set it apart from body text, and the honest answer depends on whether your interior prints in color or black and white.

For color interiors, a light tint fill behind the box works well and reads cleanly. For black-and-white interiors, which is most non-fiction, a tint is a risk: a shade that looks like a pleasant light gray in your design software can convert to something darker or lighter once it actually prints in grayscale, and if the tint gets too dark, the text sitting on top of it becomes hard to read. Before you finalize a callout style for a black-and-white book, view the page in true grayscale (not just "looks gray on my screen") and check it against a printed proof if you can.

A more reliable approach for grayscale interiors is a rule rather than a fill: a thin horizontal line above and below the callout, or a full box border, with the text itself left at normal black-on-white contrast. This gives the reader a clear visual boundary without gambling on how a tint will render.

Pull quotes: use them sparingly

A pull quote lifts a short, striking sentence out of the body text and resets it larger, sometimes with a rule or extra white space around it. It is a magazine and long-form-journalism convention that non-fiction books borrow occasionally, and it works best when used sparingly, once or twice a chapter at most, and only for a line that genuinely earns the emphasis. A book that pulls a quote from every page stops feeling like a considered design choice and starts feeling like every sentence is shouting for attention. Restraint is what makes the device work when you do use it.

Keep-with-next: the rule that stops orphaned headings

An orphaned heading is a heading that lands alone at the very bottom of a page, with its first line of body text pushed to the top of the next page. It looks like a layout mistake because it is one, and it happens when the heading's paragraph style has no keep-with-next instruction attached to it.

Keep-with-next tells the layout that a heading and the paragraph immediately following it are not allowed to be separated by a page break. If there is not enough room for both on the current page, the whole pair moves to the top of the next page together. This single setting, applied consistently to every heading style in the book, quietly eliminates one of the most common tells of an unedited interior. It is easy to miss because it never shows up when you are writing, only later when the manuscript reflows into its final page count and headings start landing in unpredictable places.

Putting it together

None of these elements, headings, lists, callouts, pull quotes, keep-with-next, are difficult on their own. What makes a non-fiction interior feel professional is applying each one the same way, everywhere, for the whole length of the book. A reader should never have to pause and figure out whether something is a new heading level or a slightly larger version of the same one. Consistency is doing most of the work that people mistake for "good design."

Related: Running heads, done right · Tables and charts in print · Drop caps and chapter openers

Frequently asked questions

How many heading levels should a non-fiction book use?

Two to three levels, consistently styled, is the practical ceiling for most non-fiction. A part or chapter title, an A-head for major sections, and occasionally a B-head for subsections is usually enough. Beyond that, readers stop being able to tell one level from another, and the page starts to look cluttered rather than organized.

How do I format lists in a print book?

Use hanging indents so the bullet or number sits outside the text block and wrapped lines align under the first word, not under the marker. Keep spacing between items consistent and slightly tighter than paragraph spacing, so a list reads as one unit rather than a string of separate paragraphs.

Will a shaded callout box print correctly in a black and white book?

Only if you test it in grayscale before finishing the file. A tint or fill that looks fine in color can print too dark or too light once converted, sometimes making the box text hard to read. A safer, common approach is a rule (a thin line above and below or a full box border) rather than relying on a tint alone.

Why did a heading end up alone at the bottom of a page?

This is an orphaned heading, and it happens when the paragraph style has no keep-with-next rule attached to the heading style. Keep-with-next tells the layout engine that a heading and the line after it can never be separated by a page break, so the heading is pushed to the top of the next page instead of stranded alone at the bottom of the current one.