What you are calling voice actuation is actually just an open, unmuted microphone that is not hearing any sound input or the sound is so low that zoom ignores it or supresses it as part of it's noise suppression ability. An open microphone will be heard once it reaches a certain threshold.
Muting is a binary state. You are either muted or not muted. If you are muted you will never be heard. If you are unmuted and don't make any noise that Zoom can detect you will not be highlighted. If you are unmuted and you make some kind of sound that Zoom detects you will light up.
Let's not confuse muting with nose suppression. It's considered a best practice to always mute yourself when you are not speaking.
https://support.zoom.us/hc/en-us/articles/203024649-Muting-your-microphone-when-joining-a-meeting
https://support.zoom.us/hc/en-us/articles/360046244692-Configuring-professional-audio-settings-for-Zoom-Meetings#:~:text=Click%20your%20profile%20picture%2C%20then%20click%20Settings.,-Click%20the%20Audio&text=Click%20the%20Audio-,tab.,background%20noise%20reduction%20when%20needed.
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