I am preparint a presentation in beamer using the theme "beamerthemeshadow". In all slides, next to the superior border, a list appears always with section and subsection name, highlighted depending on the part of the presentation I am. It worked fine, but I observe now, in some part I added 5 subsubsections, and now the "box" (what is the right name for this?) grew a lot, so now it takes half slide! I do not udnerstand this since subsubsections do not appear on this object. Can you tell me how do I solve this? Thanks
P.D. And how can one shorten the name of the subsections and sections as they appear on this "box"?