Along with the below config in hugo.yaml you need to add the google_analytics.html as well

1. hugo.yaml

services:
  googleAnalytics:
    id: G-XXXXXXXXXX
  instagram:
    disableInlineCSS: true
  twitter:
    disableInlineCSS: true

2. Create layouts/_internal/google_analytics.html and copy the content from here https://github.com/gohugoio/hugo/blob/master/tpl/tplimpl/embedded/templates/google_analytics.html

3. Search in your project google_analytics.html and you should see themes/PaperMod/layouts/partials as below screenshot