When scrolling up a chat screen, a Back to Bottom button pops up at the bottom right corner. Holding a phablet with their left hand, a user is almost asked to defy the laws of anatomy in order to reach it. Depending on how they like to hold their phone, that may be beyond any possibility. Holding it with the right hand, a user is forced to flex their thumb backwards in order to reach this button, by so putting a lot of stress on the muscles in the area as they were not designed for such a movement.
The fix? I moved the button to the center of the screen, at a horizontal and vertical position that is comfortable for either thumb. I enlarged it for better tappability (from 36px to 44px) and gave it a 75% opacity so it blends better with the messages underneath it. I am thrilled by the thought of researching how these possible features meet users, especially heavy ones.
Swipe image above to see result