Dashboard. Under the tiles, the chart has three buttons: 24h, 7d and 30d. 24h is the one that opens.
Open Dashboard. Fleet over time sits under the tiles. 24h is highlighted. The lines are machines online, needing attention, open alerts, and failing checks, one point per hour. 7d and 30d are the other two ranges. The tiles themselves are Read the dashboard.
Press 7d. The button highlights and the chart reloads for seven days. Hour labels become day labels. 30d is the same control for a month. Nothing else on the dashboard changes. The range stays on this browser until you press another button.
The tiles above the chart are Read the dashboard. Disks heading for full are See which disks are filling up. One machine's own chart is Read a machine's trends.