Document STYLES, WATERMARK

Document Styles:
A style is a set of formatting characteristics that you can apply to text, tables, and lists in your document to quickly change their appearance. When you apply a style, you apply a whole group of formats in one simple task.
 
When working on long documents, styles allow you to format your document quickly while keeping the formatting consistent. Styles are used for creating a Table of Contents which is an overview of the topics discussed in a document.
 
The Styles group is located on the Home tab and contains a set of Quick Styles. Throughout this tab can change the theme, colours, fonts, effects and paragraph spacing for the themes that are currently set upped to the document.
 
To Modify a Style:
To quickly change all the text that is formatted with a particular style, you can redefine the style.
For example, if your main headings are 14 pt Arial, flush left, and bold, and you later decide you want your headings to be 16 pt, Arial Narrow, and centered, you don't have to reformat every main heading in your document. Instead, just change the properties of that style.
 
How to do adjustment for current paragraph spacing setup for active theme?
Select Design Menu =>Click Paragraph Spacing Tool => Click Custom Paragraph Spacing => In the Paragraph Spacing Area, you can type like “4pt for before and 8pt for after” => Select Only In This Document option button => Click OK.

For more understanding, look at the screenshot please:

Water Mark:
When fine paper is held up to the light, it shows a watermark, an image embedded into the paper. The image is impressive but faint. Word 2016 lets you fake a watermark by inserting faint text or graphics behind every page in your document.
 
The faint watermark is a great way to show that the document requires special treatment without distracting from the content. When you need to add a watermark, you can add picture or ghost text, such as “confidential” or “urgent” behind the content on the page. And MS-Word 2016 comes with several common watermarks, including Draft, so you can let others know the status of your document. When you add a watermark, it'll appear on every page except a designated title page.
 
How to add the watermark text as I wished to this document?
Select Design Menu => Click Watermark Tool => Click Custom Watermark => Select Text Watermark option button => Type the text in the text box and do other setups as you like => Select Diagonal option button => Click Apply => Click Close.
 
For more understanding, look at the screenshot please: