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The tile option would only be available to tile multiple panels. When you say "uniform", do you mean that you want them to be all the same size, or do you just want them to fit together, edge to edge? Placing them manually is an option, but not really practical for a large number of photos.
Are you trying to have it create the pages automatically, or are you placing the photos on the page manually?
Elements is more of a photo editing software than a page layout software, so what you are doing is much of a round hole, square peg problem. You can do it, but it's not the best software for it. In Elements, you are essentially working with one "canvas" at a time. But you can put several pictures on a page by creating a layer for each one. This will keep them separate so you don't lose the ability to move them around.
If you have an open image and you want to create a new, blank layer, here’s how to do so:
In the Photo Editor, in Expert mode, click the Create New Layer icon at the top of the Layers panel. A layer with the default name Layer 1 appears in the Layers panel.
In the Photo Editor, in Expert mode, select New Layer from the Layers panel menu (click the down-pointing arrow in the upper-right area of the panel).
If you create a layer by using either of the preceding two methods, you open a dialog box in which you name your layer and can specify other options for blending and opacity. Provide a name for your layer and click OK. You should specify the other options directly in the Layers panel later.
When you create the layers, you can paste an image to each one - then to move each image, you can just move that layer.
There are newer versions of Family Tree Maker that would do it, probably with less trouble.