A links purpose (endnote, index, etc) can't actually be determined without additional semantic epub:type info and that would only be in epub3. I can try and determine why the target info is empty. It should not be. The provided testcase has all external links so it did not test that.
Sigil also doesn't need to remember column sizes, as they are auto resized to hold the required info in each column. Sigil should also remember any window sizes set.
I will look to see why the target info is not set for internal link targets in the report. With target file set and sortable you should be able to group/identify index entries from the filename. Possibly endnotes too if they are stored in a recognizable filename or names.
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