Curve Display
Reference
Mode:
Edit Mode
Panel:
3D Viewport ‣ Viewport Overlays ‣ Curve Edit Mode
When in Edit Mode, curves have special overlays to control how curves are displayed in the 3D Viewport.
Handles
Toggles the option to display the Bézier handles.
Normals
Toggles the display of the curve normals.
Normal Size
Length of the axis that points the direction of the normal.