Figured bass duration line exceedingly thin, almost invisible, and too long

Just add some figured bass items and look!

This is how F.b. looks like at the moment.

At 100% the duration line seems totally absent. At 800%, it can be seen that it is there, but it is exceedingly thin. It is also too long, as the gap between one line and the next is very hard to see.
For the sake of completeness, I am adding a very short score with a few F.b. items