These can be chosen in Gable Options.
The options for Infills are accessed in the drop-down menu for the left and right sides.
None (No Beams) will give an open Gable.
Infill beams ONLY will add an end beam and gives the option of also adding an infill strut.
Other choices are:
Fibre Cement sheeting
Colorbond single sided
Colorbond double sided
Polycarbonate sheeting
There is currently an issue with flashings supplied for Custom Orb infills
Please access the workaround here