Light, medium, heavy: designing for content density

Ask presentation designers what goes wrong most often in slides made by non-designers, and the answer is nearly always the same: too much on the slide. Ask the same question about slides generated by Copilot, and you will hear the same answer, with a twist — sometimes there is too little.

Density is the amount of content a slide carries and how much space surrounds it. It is one of the most consequential decisions on any slide, and one of the hardest for a model to get right without being shown. That is why Microsoft’s guidance for Copilot templates asks specifically for examples at three densities: light, medium and heavy.

Diagram showing a light, a medium and a heavy slide, with Microsoft's description of each content density

Microsoft’s three densities

Microsoft describes them this way:

  • Light: “Titles/subtitles only, generous whitespace.”
  • Medium: “Balanced layouts (e.g. text on one side and a large image).”
  • Heavy: “Content rich slides with minimal whitespace, including dense text.”

The point of including all three is not that every presentation should use all three. It is that Copilot needs to see what your brand looks like at each density, so that when content arrives it has a model for how much to put on a slide and how to arrange it.

What each density is for

It helps to think of density as matching the job the slide does and the way it will be consumed.

Light slides: for a single idea, spoken

Light slides carry one message: a title, a statement, a section break, a single number. They work when a presenter is speaking and the slide’s job is to anchor attention. They are the natural choice for keynotes, openings, transitions and moments of emphasis.

Design notes: the typography does all the work, so hierarchy has to be unmistakable. Whitespace is part of the design, not leftover space. A light slide with a small title floating in empty space looks unfinished; one with a confident, well-sized statement looks deliberate.

Medium slides: for explanation

Medium slides balance a message with support — a few points and an image, a short explanation and a chart, a comparison of two options. They are the workhorses of most business presentations.

Design notes: the relationship between the elements matters most. Which comes first? Which is dominant? Microsoft’s example — text on one side and a large image — is a classic medium layout because it gives each element a clear zone.

Heavy slides: for reading

Heavy slides carry detail: dense text, full tables, multi-part diagrams. They are right when the slide will be read rather than presented — pre-reads, appendices, reference material, documents sent by email.

Design notes: heavy doesn’t mean crowded. A well-designed heavy slide uses a strong grid, clear grouping and careful type sizes so that a reader can navigate it. The failure mode isn’t density itself; it’s density without structure.

Why density is where generated decks go wrong

Copilot has to make a density decision on every slide it generates, and generated slides can go wrong in two directions.

Overfilling. Given a rich source document, a model will often carry too much of it onto each slide. Text shrinks to fit, bullets multiply, and a slide designed to be presented becomes a slide that has to be read.

Underfilling. Given a light layout and substantial content, a model may compress something important into a single line, losing the substance the audience needed.

Both failures often share a root cause: the model didn’t have a good example of what your organization does with that kind of content at that density. With only one example per slide type — often a sparse, idealized designer’s version — Copilot sees a single density and applies it to everything.

Designing density examples for Copilot

A practical approach:

Build density variants for the slide types that need them. Content slides and data slides almost always need all three. Title slides and closing slides usually need one. Don’t create variants that nobody would use.

Make each variant a finished, realistic slide. Microsoft recommends complete end-to-end layouts demonstrating a single use case. A density example should look like a real slide from a real deck, with realistic amounts of text, not placeholder filler.

Show your limits, not just your ideal. If your organization genuinely makes heavy slides for pre-reads, show the heaviest slide you consider acceptable. That teaches Copilot a ceiling. If you only show light slides, it has no idea where the ceiling is.

Size placeholders to match. Microsoft notes that Copilot uses placeholder size to decide how much content belongs in a slot. A light layout with a huge body placeholder sends a mixed signal. And because “Copilot does not change the font size or placeholder size,” a heavy layout needs a body placeholder and type size that genuinely fit heavy content.

Keep structure visible in heavy examples. Clear grouping, consistent alignment, a visible grid. The model learns structure from structure.

Using rules to reinforce density

Examples teach density by showing. Since September 2026, you can also reinforce it by telling:

  • Note instructions in a template slide’s speaker notes — “Keep the text minimal,” “Title only,” “No more than four bullets” — guide how Copilot uses that slide. “Keep the text minimal” is one of Microsoft’s own examples.
  • Brand Skills can set organization-wide rules: “One idea per slide,” “Move supporting detail to the speaker notes,” “Keep slide titles under twelve words.”

Rules and examples work best together. An example shows what a good medium slide looks like; a rule tells Copilot when to choose it.

Testing density

When you test a template, include prompts that push density in both directions:

  • a short, simple request that should produce light slides;
  • a long source document that tempts overfilling;
  • a request for a pre-read that should produce heavy but structured slides.

Look specifically at text size, bullet count and whitespace. If Copilot overfills, strengthen heavy examples’ structure and add density rules. If it underfills, check that medium and heavy examples exist for that slide type.

Key takeaways

  • Microsoft asks Copilot templates to show light, medium and heavy slides.
  • Light is for single ideas presented aloud; medium for explanation; heavy for reading.
  • Generated decks often fail on density — overfilling from rich sources, or compressing too much.
  • Build finished, realistic variants for slide types that need them, and show your ceiling.
  • Reinforce with note instructions and Brand Skills, and test both directions.

Want your template to teach Copilot how much belongs on a slide? Have your template scored.**

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