How to cover microphone from work computer

I have a work computer that was given to me by the company I work with all the software pre-installed I have little to no permission to alter it. I’ve already bought one of those covers that I can put on the webcam whenever I’m not in a video call. But what can I do to make sure that the microphone cannot hear me outside of the time I let it? This is pretty important to me since I’m working …

computer microphone privacy work