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### Preferences Dialog

This dialog controls some parameters which likely will not be changed frequently.

- Check-Point - how often the layout is saved to the check-point file. Setting this value to 0 disables writing the Check Point file.
- Units - chooses English (inches) or Metric (centimeters) measurements.
- Angles - controls the angle system. Polar: 0° is up and angles are measured clockwise, or Cartesian: 0° is to the right and angles are measured counter-clockwise.
- Minimum Track Length - specifies the minimum length of a track. Shorter tracks will not be created.
- Connection Distance - the maximum distance between End-Points that can be connected. This affects the Join command and auto-connection during Parallel commands and when placing Turnouts. Changing this value is not recommended.
- Connection Angle - as above for the Angle between End-Points.
- Drag Distance - controls how far you can move the cursor (in pixels) before XTrkCad considers the action to be a drag instead of a click.
- Drag Timeout - controls how long you can hold a mouse button down (in milliseconds) before XTrkCad considers the action to be a drag instead of a click.
- List Labels - controls the format of titles for Turnouts and Structures displayed in lists (such as the Parts List).
- Minimum Track Radius - Curved Tracks with less than this radius are drawn in the Exceptional color.
- Maximum Track Grade - Tracks with more than this grade are drawn in the Exceptional color.

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