[header] How to make a poster with picture collage maker pro [title] Download picture collage maker pro and install on the desktop. [step] Then you can apply it into full play. [title] Adjusting page size and choose background. 
[step] Click the collage button of the top toolbar, you'll catch a glimpse of collage panel setting and background setup. Open the collage panel setting, you can resize the collage as you want, the width, height, predefined and orientation are waiting for you to adjust.