Power BI report design: UX rules for clearer dashboards
Clear Power BI reports start from the questions readers ask, not the data available. Put the most important numbers top left, compare them with a target or last year, and keep each page to one purpose. Use colour for meaning rather than decoration, keep filters in the same place on every page, add short sentences that explain trends, design a phone layout for key pages and keep load times low by limiting visuals per page.
Why do Power BI reports get hard to read?
Power BI makes it easy to add visuals, so reports tend to grow until every page is crowded. Each visual made sense to someone, but together they hide the answer. Good report design is mostly about removing things: one question per page, a clear reading order, and only the colours and visuals that help. Our general guides to effective dashboard design and dashboard design rules cover the principles; this article applies them to Power BI.
How should you structure a report?
Start from the questions readers ask at different times. In our Omantel project, four daily questions shaped the suite: what came in overnight, are we on target, who has too much on their plate, and how did we do this month.
How should you order a page?
- Headline numbers top left: People read from the top left, so put the most important KPIs there.
- Always add a comparison: Show each number against target, last period or last year.
- Main trend in the middle: One chart that shows direction over time.
- Breakdowns below: Split by the dimensions readers use to act.
- Detail last: Tables and drill-through pages for those who need them.
How should you use colour?
- Colour means something: Use colour for status, priority or category, never only for decoration.
- Same colour, same meaning: A colour should mean the same thing on every page and report.
- Neutral by default: Grey for context, colour only for what needs attention.
- Accessible contrast: Check text and chart contrast, and do not rely on colour alone.
- Use a theme file: A Power BI theme JSON keeps colours and fonts consistent across reports.
For the theory behind colour choices, see choosing UI design colours.
Where should filters and navigation go?
Sync slicers across pages so a date or region choice follows the reader. Add a clear “reset filters” bookmark. Use page navigator buttons rather than relying on tabs at the bottom, which many readers miss.
Should reports include text?
Yes, a little. A title that states the finding (“Incidents up 6% on last year”) is more useful than a label (“Incident trend”). Short sentences next to a trend, generated by the narrative visual or written by the owner, help readers who scan quickly. Microsoft’s narrative visual can update text with filters; see anomaly detection and smart narratives.
How do you design for mobile?
Power BI lets you create a separate mobile layout for each page. Build one for the pages people check on the move, usually the overview. Stack headline numbers at the top, keep one chart per screen and make slicers large enough to tap. Test on a real phone over mobile data.
How do you keep reports fast?
| Cause of slow pages | Fix |
|---|---|
| Too many visuals | Aim for fewer than about 10 to 12 per page; move detail to drill-through |
| Heavy measures | Simplify DAX and use variables; check with Performance Analyzer |
| Large imported tables | Remove unused columns and summarise where possible |
| Many high-cardinality slicers | Use search or hierarchy slicers instead |
| Custom visuals | Prefer built-in visuals where they do the job |
How do you test a report with users?
- Give real tasks: For example: “find which team has the most open incidents”.
- Watch, do not explain: Note where people hesitate or click the wrong place.
- Time the key question: The main question should take seconds, not minutes.
- Fix and repeat: Two or three short rounds catch most problems.
This is the same approach we use in product design; see our guide to usability testing methods.
Should you build a design system for reports?
If your organisation has more than a handful of reports, yes. A small report design system includes a theme file, a page template with fixed positions for title, filters and navigation, a set of approved visuals for common needs, and written rules for colour and wording. New reports start from the template, so readers always know where to look. It also speeds up building, because authors stop making the same layout decisions again. Keep the system short, store it with the reports and review it once or twice a year.
How UIUX Studio helps
We bring product design methods to Power BI: research, prototypes, testing and design systems for reports. See our Product Design and Technology Advisory services, or read about SLA dashboards in Power BI.
Frequently asked questions
How many visuals should a Power BI page have?
As few as the question needs; many teams aim for under 10 to 12.
Should I use a theme file?
Yes. It keeps colours, fonts and styles consistent.
Where should slicers go?
In the same place on every page, usually top or left.
Do I need a mobile layout?
For pages people check on the move, yes.
How do I find slow visuals?
Use Performance Analyzer in Power BI Desktop.