One line, as in standard word processors applies inline CSS styles to each new p tag. The CSS styles defined for a website usually cause paragraphs to be rendered closer together. This style is often more familiar to users who have worked with desktop publishing applications, which provide greater typographic control. Users can include more space between paragraphs by pressing Enter twice to add a standard HTML paragraph (p) tag.
Two lines, as in web page editors adds standard HTML paragraphs using p tags. When a user presses the Enter key, Contribute adds the HTML p tag; browsers display a blank line between paragraphs that use the p tag.
The code generated,
For an un-administered site the code will be:
<p style=”margin-bottom: 0″>This is an un-administered site.</p>
<p style=”margin-top: 0; margin-bottom: 0;”>This is an un-administered site.</p>
<p style=”margin-top: 0;”>This is an un-administered site.</p>
Site Administered by choosing Standard word processors (One line):
<p style=”margin-bottom: 0″>Standard One Line Option Chosen.</p>
<p style=”margin-top: 0; margin-bottom: 0;”>Standard One Line Option Chosen.</p>
<p style=”margin-top: 0; margin-bottom: 0;”>Standard One Line Option Chosen.</p>
<p style=”margin-top: 0;”>Standard One Line Option Chosen.</p>
Site Administered by choosing Dreamweaver-style Editing (Two lines):
<p>Dreamweaver-Style Editing option chosen.</p>
<p>Dreamweaver-Style Editing option chosen.</p>
<p>Dreamweaver-Style Editing option chosen.</p>
<p>Dreamweaver-Style Editing option chosen.</p>
The following example illustrates how these two spacing schemes are rendered in a browser.
How to change the setting from Standard Word Processor to Dreamweaver-style Editing or vice versa?

thank you! this helps me
Thank you so much for this! It took me a while to figure out what was Contribute was doing and these instructions worked like a charm to fix it.