Log in as admin.
Go to a course, or create a new one and go to the course
Click cog icon (the course admin menu) > More... and then click Question bank link.
On question bank, click Create a new question... button, select Essay and click add.
Fill the form and click the Save changes and continue editing button.
When the question editing page saves and reloads there's the link with the magnifying glass icon and "Preview" text near the bottom of the form.
Hover the "Preview" and cross-check it has no leading (hovering, too) blank space.
When you create or edit a question in question bank, the "Preview" link has a leading space which looks unpretty.