No probs, this is something I’ve wanted to see in renoise for a long time and has been suggested as a native feature before. Couldn`t find the thread I was thinking of but found this one here:
https://forum.renoise.com/t/piano-view-status/35600
This tool is slightly hacky with the need to reset the instrument outs, but does provide half the functionality and let you ‘see’ at least what chords you`ve put into renoise. Only really practically possible before by detaching the instrument editor and moving that to another screen if you have one handy!