Thank you @anon848905. I had guessed that this option might only exist for the project terms list. And where I work, I am often administrator. Once I had it all ready, it was a matter or finding it in the menu under “edit”, not under “tools”, that was all.
We are having a few terms where the Greek is so vast in meaning, and those also tend to be very frequent terms, and therefore our renderings-lists get badly cluttered. Now we could experiment in splitting those cases according to meaning. For example ἀπόλλυμι with the main meaning destroy/kill might be separated from lose/get-rid-off.