I am formatting a book which has a fairly extensive index and I am trying to figure out how to change the amount of indent that long lines wrap to. The author wants to cite entire book titles which can be long and wraps. The remaining lines are indented a huge amount, much more than we need. It is two column format, and each column about 2 inches, and the indent is at least 3/4 of an inch, leaving only maybe 1.25 inches as a long thin column for the long book title.
What I would like to do is reduce the amount of indent. It is unnecessary to indent that much.
It is unclear to me where the indent settings of the index are stored or how to change them.
There seem to be two indent levels. One is for the subelements (about 3/8 inch, and the other is for wrapped lines, exactly double that.
I am using makeindex and printindex and compiling it to PDF with xelatex using the scrbook (koma) book class. I would really like to stay with these since the book is already formatted and I am nervous about swapping fundamental formatting parameters at this point.
Some web pages indicate that I might be able to use an ".ist" file, but I am at a loss to find documentation on how I would use this to change the indent level.