Size of format selection box in WYSIWYG

Hi,
is it possible to extend the size of the format box? As the screenshot shows, it takes another click (every time) to identify the heading size (is it size 1 or 2? 3 or 4?), because it cannot be fully displayed in standard box size in German. The word might have a few chars to it, but this should be possible. The vertical bar cannot be moved.

https://forum.xwiki.org/t/size-of-format-selection-box-in-wysiwyg/10520