Graph lines
The main visitor chart can be drawn in three styles: Smooth, Linear, or Points. The choice is purely visual. The underlying data is identical, only the path between data points changes.
Set it from Dashboard preferences, in the Graph lines row.
The three styles, side by side
When to pick which
Smooth
The default. Bezier curves between buckets. Reads as a continuous trend, which works well for high-volume sites where every hour has data and the chart is showing momentum, not exact values.
Linear
Straight segments between buckets. More honest about the data: there's no implied curvature between two known points. Best when buckets are sparse, when you want to see exactly where peaks and troughs land, or when smooth curves are smearing what should be a sharp step.
Points
Dots only, no connecting line. Useful when traffic is intermittent (low-volume sites where most buckets are zero), or when comparing two metrics on the same chart and the lines are getting tangled.
Where to find it
Sign in, click your avatar in the top-right, then Settings. In the sidebar, choose Dashboard. Graph lines is the third row of the preferences card.