The three boxes with lines on the right indicate alignment options. If you have already typed the text you wish to realign, you will need to highlight it. Use the alignment buttons on the formatting toolbar. Text is aligned on the left side of the page. Text is centered on the page.
Text is aligned on the right side of the page.
Text is justified across the page. If you have already typed the text you want in columns, highlight it. This will open a dialogue box that has many options for how you want your columns formatted. It is here that you make the choice between applying the column format to all of the document or just a portion. If you have already typed the list, then highlight it.