A dashboard is useful when it helps someone do something. Start by listing the questions you ask most often: are any lights still on, is a room comfortable, and which controls do you use before leaving?
Give those questions the first screen. Diagnostics and rarely used settings can live elsewhere, where they remain available without competing for attention.
Design for the actual screen
A layout built on a large monitor can become awkward on a phone. Keep labels short and descriptive, leave space around controls, and inspect the page on the device you use around the house.
Do not make color carry the whole message. A label such as “Open” can make a state understandable even when a small icon or a subtle color change is hard to see.
Keep only the useful detail
A temperature reading may be enough in one room; a history graph may help in another. Add detail because it answers a question, then remove anything that consistently goes unused.
As your setup grows, revisit the dashboard with someone else in the household. Ask them to find a control without explaining the layout first. Their hesitation will tell you where the next improvement belongs.
Dashboard setup is covered in the Home Assistant getting-started guide.