The navbar icons can be customized. You must edit the file /var/lib/mympd/state/navbar_icons and restart myMPD. It must be a valid JSON array.

FIELD DESCRIPTION
ligature the same as for home icons from material.io
title title of the icon (would be translated)
options array of the view to open (take the part before the exclamation mark and split it by the / character), ending hyphens can be ommited
badge extra html markup inserted after the icon

Default navbar definition:

[
  {
    "ligature": "home",
    "title": "Home",
    "options": ["Home"],
    "badge":""
  },
  {
    "ligature": "play_arrow",
    "title": "Playback",
    "options": ["Playback"],
    "badge": ""
  },
  { 
    "ligature": "queue_music",
    "title":"Queue",
    "options": ["Queue"],
    "badge":"<span id=\"badgeQueueItems\" class=\"badge badge-secondary\"></span>"
  },
  {
    "ligature": "library_music",
    "title":"Browse",
    "options": ["Browse"],
    "badge":""
  },
  {
    "ligature": "search",
    "title": "Search",
    "options": ["Search"],
    "badge": ""
  }
]

Other Example:

URI: /Browse/Filesystem!0/-/-/-/

  {
    "ligature": "library_music",
    "title":"Browse",
    "options": ["Browse", "Filesystem"],
    "badge":""
  },