Here's how to set up Prettier to reformat your files on save.

First install the plugin by clicking the link at If VSC is installed, it'll handle the link and open the plugin page in VSC.

Once installed, open VSC's settings page, and enable reformatting on save/paste/type.

Finally, I had one issue where files wouldn't get reformatted. The reason is there were two formatters and VSC didn't know which one to use: VSC's default formatter, and the newly installed Prettier.

To make VSC ask you which to use, I had to right click a file, and force it to format: right click, format document. That's when it asked me which one to use by default.

After choosing Prettier, it started reformatting automatically.