The Cutout Editor helps you to create additional elmenets and modify the cutouts:

1) List of all cutouts, they have an running ID and a Location X/Y for special cutouts there is also and End X/Y and an repeat Index (for each child step).

2) Edit area for the cutouts, you can modify the Location.

3) Additional Element Area, here you can define what you need on different layers

4) Auxilary Drills is special, you can generate mousebites for one or both sides.

For setting mouse bite drills we have a second video: