OAS Style Delete Help

Who can help Arun out with his question? I’m sure there is a quick and simple way to delete a style?

I’m hoping someone can help. I have an Abacus Duo Pro (third owner) and noticed there are several duplicate styles in there, probably the result of many uploads by different users. While they are not a problem, it’s clogging up the lists. Is there a way to delete these? The organ is running OAS7.
Kindest regards Arun