Defines the length of the backtie symbol line when the selected 'Backtie position' option is 'Schematic' as shown below.
This means, regardless of the real-world position of the backtie, the backtie symbology will remain perpendicular to the structure symbol, with the line length defined by this setting.
Options:
A number, expressed in metres.
Default Setting: 5m
Changing properties: If you want to change the option of this property, your Project Settings Administrator must request a project settings change.