So I have a pet peeve... something I find a bit annoying and sometimes irritating. Most Archimate elements has two figures, for example the element Grouping has a tabbed figure and a rectangle figure, both under the tab "figure". The visual elements on the other hand, have a single figure, but the figure's appearance can be changed under the tab "appearance", such is the case of the Group can be changed from... a tabbed figure, to a rectangle figure.
That's it, that's my pet peeve. Is not a big deal, but sometimes when I'm doing both visual and element groups I do find it mildly infuriating UX issue.
ArchiMate figures have a different UI to support two figures. The Group and Note figures (non-ArchiMate) have their own UI and code because in future they might support more than 2 types - tabbed, dog-ear, dashed, etc... In fact, Note supports three.