Muting chordssound in scores

I write songs with chords. Until recently they were not heard when playing a score. Now they are always heard, but I would like to be able to mute or unmute them, per song (both in the mobile app, on the web and in MuseScore 3, please). Where can I find the settings for this option?
I can't find the answer in the Help.

Thank you for answering my question.

Wiebe Glastra
Netherlands