[Plugin: Rich Text Tags] Editor is not displayed the correct way

Hi =)
This question may be completely stupid, but well, then I am ^.^

In my WP Backend when displaying the categories, the sitelayout is displayed in two rows. That cuts off a good part of the editor and makes some functions I need useless. I also can’t see the icons for media uploads (may be caused by that problem). Is there a way to display one row (like an option to choose, like in articles), or is there something I’m missing…?

http://wordpress.org/extend/plugins/rich-text-tags/