Hello Wolfgang,
You seem to have the Text Presets window open there. If you are wanting to access the fonts on your system you need to do it via the Text Tool panel itself.
On the Text Tool panel click on the button bearing the currently selected font. This should then bring up the list of available fonts found on your system.
You can use Presets for easy access to often used fonts but these are just lists in effect, to tell AR what to load. The actual fonts themselves will still be in the default font location for your system, not inside AR.