Code Live Share - keep sensitive files away from the guests. You can exclude and include content by adding a .vsls.json file.

.vsls.json

{
  "$schema": "http://json.schemastore.org/vsls",
  "gitignore":"exclude",
  "excludeFiles":[
    ".env",
    ".vscode",
    "!node_modules"
  ],
  "hideFiles": [
    "build",
    "node_modules"
  ]
}