In Word, click on Tools | Customize | Options | check the "Show Standard and
Formatting toolbars on two rows" box | OK. Do the missing buttons reappear?
If not, then click on Tools | Customize | Toolbars | Formatting | Reset. Do
the missing buttons reappear? If not, then click on Tools | Customize |
Commands | Categories: Format, and under Commands, scroll down to the
alignment buttons, and drag them to the desired position on the Formatting
toolbar.