Missing Faces Tool Options

The following options are available in the Options panel:

Maximum angle The maximum angle between all neighboring edge pairs in the potential missing face edge loop.
Maximum distance The maximum distance between all of edges in the potential missing face edge loop.
Fill Fix the missing face by extending neighboring faces until they intersect.
Patch

Fix the missing face by creating a new face through the bounding edges of neighboring faces.

Faces with a high level of detail on a boundary may have one or more short edges. To make a smooth patch on a boundary, short edges are automatically removed when patching.

Try both Fix the missing face by extending neighboring faces. If that does not work, SpaceClaim will attempt to fill by creating a patch.
Allow multiple faces Fix a hole in the surface with two or more missing faces.