Hover a chart to see the values at that time on every chart.
Drag across a chart to zoom in on that period (down to 1 hour).
While zoomed in, move along the time axis by dragging the time labels below a chart,
Ctrl + dragging or Shift + dragging the chart, middle-button dragging, or pressing ← / →.
The Statistics button shows or hides the mean lines and means.
Double-click goes back one zoom level. Esc or Reset zoom shows the whole period again.
When not zoomed in, drag the time labels below a chart (or Ctrl + drag the chart) to slide to earlier or later days
(not in the Year view), or press ← / → for the previous or next day, week, month or year (like ◀ / ▶).
Touch screen
Touch a chart to see the values; slide sideways to move along it. Tap outside the charts to hide them.
Pinch with two fingers to zoom in or out; slide two fingers to move.