i’m not using the visual editor that much (i like to write css by myself),
but the Border Section is (still?) missing the setting for the border-style. So you have to add the border-style by hand in the code. This is a little bit weird, otherwise the whole border won’t work. Probably the border-style could be a Menu with solid, dotted, double. etc… . And it would be nice if the preset would be „solid“.