After you import an AutoCAD drawing and accept the default settings, the AutoCAD file will be locked on the page. This is to protect it from being moved, resized, and deleted. If you need to select or move the file, you can unlock it.
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Click an empty space on the diagram to deselect anything that may already be selected.
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Rest your cursor on the outside edge of the AutoCAD drawing until your cursor changes to this icon:
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Right-click, and then click CAD Drawing Object > Properties.
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Click to deselect the Lock size and position and Lock against deletion checkboxes.
See also
Introduction to working with AutoCAD drawings in Visio