I updated to version 6.0.7 today (from 5.x.x) - not a very clean update process btw. Several settings where not as before.

I could not find a setting to remove doubled ticket booking lines. In most cases I need only 1 so the user has to remove the second. (see attachment)
Second, the button to add a ticket category is not in line with the first booking line. I tried to find a css setting, but couldn't find any.

Can You please provide a solution?

After clearing the cache it worked fine ! ;-)