This video shows you how to edit lines in DEX.
It shows you how to change the line style, position, start and end caps, width, and colour, including transparency.
Editing Lines
To edit a line first select it.
When a line is selected you will see 2 manipulator points, one at the start of the end and another at the end of the line.
A selected line showing the manipulator points at both ends
Click and hold either point and drag it to set the start or end of the line. If snap is enabled then the end points of the line will snap to the grid as the ends are moved.
To move a line keeping its angle to the horizontal constant, left-click anywhere on the line other than on either of the end manipulators and drag the line to its new position. If snap is enabled then the line will move in steps as defined by the grid; in this case the end points may not snap to the grid. To snap the end points to the grid, drag the end points individually.
As you drag the end points they may snap to other objects if snap to objects is enabled.
If you have any point, horizontal or vertical guides on your schematic or PCB and snap to guides is enabled, then the end points will snap to them if they are close enough.
You can set the color of the line by either left or right-clicking on a color button in the color bar at the base of the application viewports.
You can also set the lines parameters using its properties panel.
Line Properties Dialog
You can also edit the parameters of the line using its properties panel as shown below. To view the properties panel first select it. Then right-click on it, then select Properties Panel from the context menu that opens.
Click the 
button to show this help topic.
Start
This is the start point of the line.
End
This is the end point of the line.
Layer
Use this to set the layer on which the line lies. This only applies to PCBs.
Locked
Check this box to prevent its properties from being altered or the line being moved.
Line Style
Here you can set the style of the line.
This includes the:
•dash/solid style
•The width
•The start and end caps
•The lines color.