Durability Viewer standard display
Durability Viewer showing your free inventory slots (31), slightly damaged bow and helmet (negative, what's missing to 100%), more damaged pick and chestplate (positive, remaining durability), arrow count (59), and undamaged pants/boots.
Armor around Hotbar mode
In this mode, the armor is shown around the hotbar, and the "percent to show damage" option is set to 100% so you'll always see remaining durability instead of item damage taken. (These options can be set independent of each other).