When you create a new audio track (Voice & Microphones or Instrument), it will have a preset of effects enabled by default. One of these effects is called reverb, which simulates a space (hall, room etc).
To remove the effect, first make sure that you're in the Instrument view (1) and that you've selected the track you just created (this view is selected automatically when a track is created). Then drag the parameter that says "Reverb" (2, 3) all the way down to the bottom.
(1) Instrument view
(2) Voice & Microphones preset reverb
(3) Instrument preset reverb