I can see the _number_ of active seeds by hovering over the
Tx icon in the tray.

The Category "Seeding" only shows the total number of open seeds.

Is there a display for the active seeds as they come and go?
I have been visually inspecting these but it is hard to track
with a large number of small files blended in with more substantial- sized ones.

I would submit this as a feature request if it is not something I have missed in Tx's  many features.