Change keyword graph view settings

The user has several possibilities to adjust the appearance of the keyword graph view

1. Adjust the number of keywords shown in the keyword graph (1). The user specified number of keywords (e.g. 20) with highest frequency are shown.
2. The user can show/hide edges according to their importance (2). Importance means edge frequency (i.e., co-occurrence of keywords in documents).
3. The user can adjust the view:
1. Toggle Tags with their relations to the keywords (3).
2. Show/hide legend (4)
3. Show keyword graph in full screen mode. Resume full screen mode by pressing “ESC” button.
4. Reset focus of the view.
5. Zoom in or out in the view.