Is it possible to remove the sort button from the furnaces because it is interfering with my other plugins?

Yep! Just add it as a blocked item in the config;

{
  "UI Settings": {
    "Anchor Max": "0.7 0.15",
    "Anchor Min": "0.6564 0.1",
    "Hex Color": "#6f8344",
    "Font Size": 13,
    "Text": "Sort",
    "Text Color": "#A5BA7A"
  },
  "Blocked Items (short or long prefabs accepted)": [
    "locker.deployed",
    "furnace"
  ]
}​

Oh hell lol