- Click Photo Gallery from the menu on the left of your WordPress dashboard.
- From the list under Photo Gallery, click Themes.
- Click Edit under the theme you’re using.
- Select the layout you’re using from the buttons under Theme title.
- Find the option named Alignment and select Center from the drop-down menu.
- Click Update to save the changes.
Note: “Theme” options are only available in the premium version of Photo Gallery.