Version: (using KDE KDE 3.5.3) Installed from: SuSE RPMs Version 3.3.3. However this bug is present for a quite time now I just forgot to report it.
What UI mode ? -IDEAl ? -simplified IDEAl? -Tabed pages ? -...
IDEAI, not simplified.
Please try the simplified IDEAl mode.
Some toolbar appeared on the top (bug), the editor item in settings duplicated (bug, reported), but it didn't work either. I fiddled with options for a while, and I found out, that "show close button" requires "show icons on tabs" to be turned on. Otherwise it won't work.
Both options now work in random way, it seems that KDevelop doesn't use those settings and works in its own way.
This dialog should be fixed in revision 614187.