The stair icon is for the number of contours. It’s not an exact match for Illustrator’s Offset Path. Corners can be mitered, rounded or beveled. For Corel Draw, I think using mitered corners is equivalent to automatically setting Miter Limit to the maximum in Illustrator.
This does seem to be the way to do it in Corel Draw, according to the tutorial Jules shared some time ago ( CorelDRAW - Adjusting for Kerf in your Design ).
If I am understanding Miter Limit correctly, I don’t think it would relevant here. The obvious gaps are mostly along (relatively) long curves.