Flip the tab to switch the position.
The night position will help to reduce the glare from headlights behind you when driving after dark.
Keep the inside and outside mirrors clean and adjusted for best visibility.
Adjust the mirrors before you start driving.
Front Seats
Honda Civic Service Manual. Headlight Adjustment ('12-'13, '14: 4-door)
1.
Headlight - Adjustment
Headlights become very hot during use; do not touch them or any attaching
hardware immediately after they have been turned off.
Before adjusting the headlights:
...