You can mark laps at any time during a ride. You have the option to turn on Auto-Lap or mark Laps manually. You can also manually mark Laps even if you have Auto-Lap turned on. Also, see: Karoo 2 - Auto-Lap
To manually record a lap when you are on a Numeric/Graph Screen,
Click the bottom left (B) button or Tap on the "⟳" Icon.
The Lap number with a mini-summary (Lap time, Lap distance, Lap avg speed, and Lap max speed) will be displayed for 3 seconds on the screen.
To manually record a lap when you are on a Map Screen,
Double-Click the bottom left (B) button.
You will be able to see full breakdowns of the Previous Laps.
You will also be able to mute the Lap Drawer.
When muted, the drawer does not pop up when a Lap is recorded.