See the following for more information:

Alignment

The "Alignment" setting controls the text alignment you want to see when reading eBooks. The default options provided are

The default alignment is "Default". If you are familiar with HTML and CSS, then you should know that any valid "text-align" value can be used here.

Note: This setting is applied at the top level eBook element and acts as a default setting. If lower level elements define alignment options, then those will take precedence over this setting.

Default Display Settings
1. Default Display Settings
Set Alignment
2. Set Alignment
Select Alignment Option
3. Select Alignment Option
Alignment Option Applied
4. Alignment Option Applied