Check this from official vscode setting:
// Controls whether `editor.tabSize#` and `#editor.insertSpaces` will be automatically detected when a file is opened based on the file contents.
"editor.detectIndentation": true,
// The number of spaces a tab is equal to. This setting is overridden based on the file contents when `editor.detectIndentation` is on.
"editor.tabSize": 4,
// Config the editor that making the "space" instead of "tab"
"editor.insertSpaces": true,
// Configure editor settings to be overridden for [html] language.
"[html]": {
"editor.insertSpaces": true,
"editor.tabSize": 2,
"editor.autoIndent": false
}