# Control Dimension Geometry [GstarCAD 2022](Help%20System/GSTARCAD/2022/Index.md) → [User Guide](Help%20System/GSTARCAD/2022/User%20Guide/(User%20Guide).md) → [Dimensions](Help%20System/GSTARCAD/2022/User%20Guide/Dimensions/(Dimensions).md) → [Use Dimension Styles](Help%20System/GSTARCAD/2022/User%20Guide/Dimensions/Use%20Dimension%20Styles/(Use%20Dimension%20Styles).md) The appearance of dimension lines, extension lines, arrowheads and center marks can be managed.  Control Dimension Lines Controls the dimension line properties like color, lineweight and spacing . Control Extension Lines Controls the extension line properties like color, lineweight, overshoot and offset length. Control Dimension Arrows Controls the arrow's type, size and visibility in dimensions and leaders. Customize Arrows You can create your own custom arrows by defining a block. To use custom arrow, select "Use Arrow" option in the list of arrow and specify the name of the block definition.