Reply To: Does upgrade require a migration?

In order of your requests:

1. Use:

.single-post .entry-footer {
  height: 34px;
  overflow: hidden;
}

See: https://startupwp.com/topic/customizing-your-theme/

2. For showing post content in a page, checkout this plugin:

http://wordpress.org/plugins/post-content-shortcodes/

3. Looks like you figured out how to remove the breadcrumbs.