Use the Lock feature in the V-Groove Dimensions section to lock the current size of the object V-Groove to avoid adjusting it by mistake when dragging the mouse.
Click Unlock to Lockthe size of the current object.
Click Locked to Unlock the size of the current object.
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Lock Object Size Definition
Use the Lock/Unlock feature to prevent the size of the opening from being changed by accidentally dragging the control corners with the mouse in Designer.