All the parameters of a Curve Object are displayed in its Properties window where you can edit them accurately.
To change the properties
Select the object and perform the following operations:
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Open the Properties dialog box in one of the following ways:
Double-click on the object.
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Press the key combination ALT+Enter.
 Click the
 button in the toolbar.
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Activate the context menu with the right mouse button and choose the command Properties.
 
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Modify the parameters of the object. To preview the changes, click the Apply button.
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Click on OK.