Remove a page border
Click on the border to select it. If you can’t select the border, it’s probably on a master page. On the Page Design tab, click Master Pages, click Edit Master Pages, and then try selecting the border again.
Note: If you’ve selected an object that you did not want to remove, simply press CTRL+Z to undo the removal.
Remove a border around a picture, text box, or other object
Right-click on the picture or other object and choose Format <object type>.
On the Colors and Lines tab, click Color and select No Outline.