The order in which the groups appear in the overview table can be determined by the p-admin.
In order to arrange groups, proceed as follows:
Choose "Groups & Users" from the main menu by clicking on it.
Click on the "modify"-button in the row "Editing groups".
Now, you see a list of all available groups.
Highlight the group you want to move. In order to do so, click on the radio button
next to the respective group.
Decide above which group you want to move the highlighted group. Then, click on the arrow in this row.
Repeat steps 4 - 5 until you are satisfied with the result.