If you edit your

dendron.code-workspace

file, you'll see a

"folders"

section like:

json
  "folders": [
    {
      "path": "dendron-docs/vault",
      "name": "dendron.docs"
    },
    {
      "path": "dendron.blog/vault",
      "name": "dendron.blog"
    },
...

You can move these around to get it to the order you want.