Click on the pencil in the upper right of each box to edit. Adjust the width in the Style Tab.
This Template is:
Page Photo Layout 1 x 3
It Has Three Image Boxes L-R Duplicated One Time
Click on the pencil in the upper right of each box to edit. The images should have a square aspect ratio of 800 x 800 pixels or better. Images can be cropped and saved in the Media Library.