1. Create a "shape" on top of/over your template image (probably a rectangle, if your template was added as an image and has a squared off bottom edge).
2. Double click on your rectangle, and "fill" with the exact same color as the main page area of your template/image (use the eyedropper color sampler to add as Custom color).
3. Position your rectangle overlapping the bottom edge of your page/template, sizing it properly width-wise to be a perfect "extension" and then 'pull' it down (making taller) to whatever length you need to act as a seamless page "filler".
4. Add/lay over this "filler"/page extender any additional text boxes, elements, images, etc. as needed to populate your longer page.

Repeat this practice for individual pages as needed.

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