Go to Tools > Options > Mechanical Design > Drafting > Manipulators tab. In the Dimension Manipulators area, select the Modification check boxes corresponding to the Modify overrun and the Modify blanking options.
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Drag the overrun manipulator(s) to a new position.
If you want to modify one extension line only, press the Ctrl key and drag the desired manipulator. -
Drag the blanking manipulator(s) to a new position.
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If you need to be more precise, double-click the manipulator. The Blanking Edition dialog box is displayed.
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Enter the desired value to modify the blanking.
You can also modify the overrun/blanking of only one extension line of the dimension. -
Double-click the overrun manipulator(s).
The Overrun Edition dialog box appears.
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Enter the desired overrun value and un-check the Apply to both sides option from the Overrun Edition dialog box.
The overrun is applied to one side only.
- Note that you can also right-click the dimension and select the Edit > Properties option from the displayed contextual menu. The Properties dialog box appears. Select the Extension Line tab and modify the desired value(s) of the Overrun / Blanking Extremities option(s).
- To set Cumulate dimension extension line length and text position, customize the Cumulate Dimension parameters in the standards.
- Overrun is the overrun minimum value. As an example, for a
cumulated dimension (for ISO Standard):
You can increase the overrun size: You cannot decrease it below the minimum value: 
