The Overview window serves as a navigator for big design files that occupy more space than is available in the Design window. The Overview window shows the currently displayed area in the design and you can move the focus by clicking into the rectangle and moving it to the desired location in the design file.
By default, the Overview window is a docked window in the bottom left part of the application. You can, however, undock the window and drag it to any position within the application.
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