Hi ronopp,
Well you may have a MIXER application where you control that.
I guess it depends on which one you have. It happens that on my computer it's NVidia NVMixer...maybe the way mine works will be similar enough to yours that it'll help you find your mic control?
The microphone has a checkbox for output which you want to select.
Then it also has another checkbox for input , and that's what controls whether the mic plays over your speakers or not.
If you look for your audio mixer application you may find mic controls that look similar. Good luck!