Remove End Cut of Edge command removes the gap created by define end cut to edge.
Location of Remove End Cut of Edge Command
You can access it from the ribbon menu Modify tab under Entity Edit title.
Click the Remove End Cut of Edge icon.
Click on the edge of the sweep that was previously cut.
It will erase the gapcreated with define end cut to edge.
The initial version of the sweep
Selecting the edge of the cut sweep
Deleting the gap created with define end cut to edge