I have opened a dxf drawing in SW and saved one block.

I need to fully define this block/sketch before I can make a feature from it.

There is no option to Select Chain.

Repair Sketch reports two points gap at each visible point.

Select Other on a tangent point reports the line, the arc, and 2 points.

I cannot see a gap between them in the magnified view or a zoom in view; the lines always join.

How can I achieve Full Definition?