VSCode single to double quote automatic replace

Question

When I execute a Format Document command on a Vue Component.vue file VSCode replace all single quoted string with double quoted string.

In my specific case

Answer 1

I dont have prettier extension installed, but after reading the possible duplicate answer I've added from scratch in my User Setting (UserSetting.json, Ctrl+, shortcut):

"prettier.singleQuote": true

A part a green warning (Unknown configuration setting) the single quotes are no more replaced.

I suspect that the prettier extension is not visible but is embedded inside the Vetur extension.