Hi press F11 to make it a small window and you will need to determine where the window top bar would be and move it like a regular window and can be resized in the same way as a normal window if you can determine the edge of the top of the window to resize as needed.
as for the microphone you will need to press toggle strait after you finish talking into it to turn it off to stop that from happening but this is just temporary until i make the mic only work on holding a certain button on the keyboard until key released.