When you select two or more measurement markups, you will find a toolbar floating around the markups. Click the corresponding buttons directly to center, align, or distribute the selected measurement markups. You can also find the Page Center/Alignment/Distribute buttons from the Style sub-tab in the Format tab or the context menu after you right-click them. For more information about the buttons. For more information about the buttons, please refer to Arrange comments.
HTML User Manual Product
Foxit PDF Editor for Windows