Preventing changes to shape attributes in Visio (like width or height) and locking shapes from being selected are handy ways to prevent changes to your drawings.
Shape protection requires the Developer tab to be visible. By default, this tab is hidden.
Enable the Developer tab
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Click the File tab and then click Options.
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Click Advanced, and scroll down to the General section.
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Select Run in developer mode and then click OK.
Prevent or allow changes to shape attributes
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Select a shape in your drawing.
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On the Developer tab, in the Shape Design group, click Protection.
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Select the shape attributes that you want to lock, or clear the check boxes for the attributes you want to unlock, and then click OK.
Note: If an ink shape can be selected for editing (with one of the available pen tools), the ink strokes can be added to or erased from the ink shape even when various shape attributes are selected in the Protection dialog box. To prevent any changes to an ink shape, lock the shape against selection.
Lock or unlock shapes from selection
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Select the shape or shapes that you want to protect.
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On the Developer tab, in the Shape Design group, click Protection. Visio opens the Protection dialog box.
Note: To learn more about all the various options on this dialog box, see Protection dialog box.
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Select the From selection check box, and then click OK twice.
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On the Developer tab, In the Show/Hide group, select the Drawing Explorer check box.
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In the Drawing Explorer window, right-click the name of the drawing, and then click Protect Document.
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Under Protect, select Shapes, and then click OK.
To allow shapes to be selected again, follow the previous steps, but clear the Shapes check box, and then click OK.
