You can choose how your vehicles are grouped in the vehicle list (and if they are grouped at all):
To do so, you must open Map settings and click on the Vehicle tab:
On Group vehicle in vehicle list you can choose one of the following group options:
|Vehicle type (default)|
|Free field 1-5|
|Tachograph work state|
Additionally, you can also choose whether or not to see the vehicle counter for each of the groups using the flag Count vehicle in groups in the Map settings.