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Helmet selected as the priority repair target. XP collected will repair the helmet first.
Boots selected as the priority repair target. XP collected will repair the boots first.
Pressing L cycles through repair modes. This shows the actionbar message when Vanilla mode is active — normal Minecraft behavior.
Leggings selected as the priority repair target. XP collected will repair the leggings first.
Chestplate selected as the priority repair target. XP collected will repair the chestplate first.

"Lets you choose which armor piece gets repaired by Mending enchantment. Press L to cycle between Helmet, Chestplate, Leggings, Boots, or Vanilla mode — actionbar shows your current target