In the new version of the Mp3tag Options window, there is a button at the bottom that is labeled "Utils." I assume that's supposed to mean "Utilities" but even that name does not describe what it is there for. I suggest you make the button bigger and call it something like "Panel Configurations" or something else more meaningful to its function.
In addition, when creating/editing a particular item in the tag panel, it is possible to change the width of the window for the tag as it appears in the panel. However, the terms Small and Smaller are not only confusing (Smaller is actually larger than Small, which seems rather odd) but not nearly as useful as naming the sizes like this: Full Width, 1/2 Width, 1/3 Width, Multiline.