This is how to remove the Jetpack share this buttons (plugin) in excerpts like homepage, archives, etc.

Here are 4 simple steps you can follow:

  1. Login to your WP-admin panel.
  2. Go to Settings.
  3. Click on Sharing.
  4. Go to Show buttons on and make sure that the box Front Page, Archive Pages, and Search Results is unchecked.Jetpack Share This Setting