The keyboard fix, which iCulture first spotted, finally puts a line through the mute icon on the MacBook keyboard. The icon used to be a speaker symbol without the sound waves on ...
TL;DR: Apple has updated the mute key on the MacBook Air M4 to feature a speaker symbol with a strikethrough ... which led to some folks confusing it with the volume down key (the next function ...
To change this to Silent mode, go to Settings > Action Button then tap on the symbol ... the volume using the side buttons; ...