When overlaying two plan pages you also have options to re-size or move the plan if it needs aligned.   Measurements on a plan can can different scales, the scale is stored with the geometry and not the plan.   The overlay itself can be  "resized" by using the drag handles.  If the base layer has a different width/height/dpi than the overlay, the user would need to resize the overlay by using the drag handles.  It's important to note that when geometries are transferred from the base to an overlay, they will be resized proportionately so they end up in the same location on the overlay as they appeared on the base layer, ignoring any movements or resizing of the overlay

To resize, hold the mouse down on one of the corner drag handles to proportionally resize the plan.  You can also resize horizontally or vertically by holding down the non-corner edit squares.  

The overlay itself can also be  "resized" by using the edit squares.  If the base layer has a different width/height/dpi than the overlay, the user would need to resize the overlay by using the drag handles.  To align the pages, hold down the CTRL key (ALT when using Firefox on a Mac) on your keyboard while pressing down with the mouse button to move the overlay. Once the pages are aligned, you will see the color purple to indicate they are directly on top of each other.  You can use text, or a corner of a room to align the pages, for example.

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