Select the text you want to justify.
In the Common
tab, click on the Justify 
button. You can also use the shortcut SHIFT+CTRL+J (Refer to list of shortcuts).
With this command text is justified to the right and left margins of the document.
Select the text you want to justify.
In the Common
tab, click on the Justify
button. You can also use the shortcut SHIFT+CTRL+J (Refer to list of shortcuts).
The selected text will be inserted between the tags <div style="text-align: justify"> and </div>