Background noise cancellation or voice activation in OBS Streamlabs?

I recently started streaming on Twitch with OBS Streamlabs and I'm so annoyed by the noise in the background… Can anyone tell me how to turn on some kind of voice activation or background noise suppression on OBS Streamlabs?

Right in the window you have your speaker display and your micro.

at Mirko click on the gear and filter. Then add to Plus (+) and NoiseGate. Then play around with the dB number until your microphone stops beating itself.