How to Do Auto Formatting of your Book Manuscript in Word?

To use the AutoFormat feature in Word, you'll first need to add it to your Quick Access Toolbar. Then, you can use it to automatically format your document by selecting "AutoFormat" and choosing a formatting style or review each change. 

Here's how to do it:

1. Add AutoFormat to the Quick Access Toolbar:

Click on the Files tab on the Ribbon and then click on Options.
In the Word Options dialog box, click on Quick Access Toolbar in the left sidebar.
From the right pane, select "Commands Not in the Ribbon" from the drop-down menu.
Scroll down and find the "AutoFormat" item in the dialog.
Click on "Add" and then click on "OK". 

2. Apply AutoFormat:

Open the document you want to format.
Click the AutoFormat tool on the Quick Access Toolbar.
Word will display the AutoFormat dialog box.
You can choose to have AutoFormat work without stopping for input or review each change, says Microsoft Support.
Click OK to apply the formatting. 

Additional Notes:

You can also adjust AutoFormat settings in Word Options, under File > Options > Proofing > AutoCorrect Options > AutoFormat As You Type to customize how Word automatically formats your text, according to Microsoft.
For example, you can enable or disable automatic bullets or numbering, or change how Word formats lists.
According to YouTube, you can also adjust how Word handles things like fractions, decimals, and dates.