I have a lot of custom segments and some need to have fairly long names, and I need to see the whole name to know which one to use. In the "Show Segments" bar, only about 25 characters of the name are displayed. Clicking on the "i" icon shows only about 38 characters. To see the whole name I either have to edit the segment, or apply the segment to the report.
My suggestion is to change the popup "i" window to be expandable enough to show the entire segment name.