Leader lines and terminators can be included on DataGroup Annotations.
In the DataGroup Annotation tool settings you can turn on leaders and select a terminator where appropriate. Go to the Building Designer menu > Annotate Tool Settings, click on the Type shown and alter as required, here it is set to none and can be changed to Leader Line or B-Spline.
The same settings apply to the symbology and terminators for Annotation tools such as Label Coordinate. The terminators for the Label Coordinate tool are stored in their own file specified by TFANNOTATION_LABELCOORDTERM_LIBFILE:
C:\ProgramData\Bentley\OpenBuildings CONNECT Edition\Configuration\Datasets\Dataset_NM\Cell\LabelCoordinateTerminator.cel
These are stored in the file specified by BB_TERMINATOR_CELLLIB, in the case of Dataset NM this is:
C:\ProgramData\Bentley\OpenBuildings CONNECT Edition\Configuration\Datasets\Dataset_NM\Cell\Terminator.cel
*TERM08 can be rotated back to vertical if appropriate.