I am trying to change the names of the topics assigned to my index entries, but the names I am typing are not being retained.
This happens for all of my index entries. No names are being retained in the .chm file.
So you are compiling CHM? Have you tried disabling the Binary Index?
Press Ctrl+Shift+Question Mark to open Project Settings.
Look at the General tab (or General section in 9) and there you should see the Binary Index option.
Helpful and Handy Links