I've found that when you reach about the 7th or 8th generation, given names are abbreviated, and middle names dropped, depending on how long the line is with event dates included. You can set the font size for "Text" on the right side of Page Setup window.But with Times New Roman set to 9 or 8 pt, I still get only the initial for a given name, even though there is "room" in the right margin.This must be built into the report output.
One of the reasons I have Family Tree Maker is to GEDCOM over my UFT data and produce FTM's super Outline Descendant Report that includes birth, marriage, death dates and places. I can choose the font and margin sizes, and names are never abbreviated. I'm hoping the next version of UFT will have this feature.