The Bending Line dialog allows you to edit the properties of a bending line. If a region has a layer stack assigned and that stack has the Flex option enabled, then Bending Lines can be placed across that region. Each Bending Line has a radius, bend angle, and an affected area width property, allowing them to be displayed in their folded state as they would be in a real-world situation.
The dialog can be accessed in the following ways:
Ensure you are in Board Planning Mode (View » Board Planning Mode). Click Design » Define Bending Line. Place the resulting crosshair in the desired location then press the Tab key.
Right-click on a placed Bending Line then select Properties from the context menu.
Bending Angle - the angle that the surface of the flex region is to bend.
Radius - the distance away from the bend surface that the bending center-point is located.
Affected area width - the width of surface area that will be bent for the given Radius and Bending Angle.
When one of the first three properties are edited/changed, the other two properties are calculated and updated automatically. Note that each Bending Line's Affected area width is displayed on the board in dark yellow.