If you don’t like the Link Preview feature, you can disable it in the following way;
- Click on the Gear icon in the top right corner (left from your own profile image).
- Scroll to bottom: to "Your app settings" section
- Click on Mail
- You should see "Options" menu/pane on left
- In the Options’ Navigation Pane on the left choose:
Mail-> Layout-> Link preview (See pic below)
- Uncheck the checkbox in front of: Preview links in email.
- Press the Save button at the tab.
- Press the Back button or Options header at the top of the Navigation Pane to return to your Mailbox.