Wrong Trill Intervall

Hello everybody! I hope you’re all having, or had, a great Saturday! I’m trying to get this trill in this bar to show a flat instead of a sharp. I’ve tried everything in the properties panel at the bottom of the screen, and nothing seems to work. I’m in the key of Eb. Can anyone please put me on the right path on what I need to do? Thanks so much!

All you should need is …

The flat is part of the key signature, so normally would not be required.

That was indeed it! Thanks so much!