It’s your PC.
You can disable your microphone, but then you can’t do group meetings on Teams, etc., which is a problem if you have to work from home occasionally.
https://www.maketecheasier.com/deactivate-microphone-windows10/
https://windowsloop.com/enable-or-disable-microphone-windows-10/
No PC mike needed.
When I did work-from-home there was a dial-in number for meetings, with an access code that everyone (including the closed-captioning transcriber) had; everyone called that number and entered the code to join the meeting.
We used company-issued laptops with the microphones disabled; work was a major defense contractor, so they were paranoid about snooping.
Captions were accessed by using the caption service website.