You haven’t adjusted the mirror properly
Because you’re leaning forward in your seat
Adjust the mirror from your normal seating position
You haven’t adjusted the mirror properly
Because you’re sitting sideways / slumped in your seat
Adjust the mirrors from your normal seating position, sitting squarely in your seat, facing to the front
You haven’t adjusted the mirror properly
Because you’re craning your head forward, peering at the mirror
Use eye movement only, from your usual seating position
You’re obscuring the mirror with your hand as you adjust it
Perhaps you’re unaware of the reasons it’s best not to do that
Use your thumb and forefinger on the corners of the mirror