Hi Helge
You will see in 'Bar Styles' that there are lot many blank rows to add new
bars. Also you may remove some of the default bar types which are not
required. But, in the same window you will see that there can be only 4 rows
for bars of each activity. That is the restriction.
If some bars are spaced out, they could also be shown in the same row.
I hope it helps.
Vanita