Use the Fruity Stereo Shaper or the "Stereo Separation" knob at the bottom of the mixer tracks.
Start with your most important element (usually the kick drum or lead vocal). Build the rest of the mix around it.
The goal of mixing is to ensure every element is heard clearly and occupies its own space in the frequency and stereo fields.
Load or Fruity Convolver on the Send track at 100% Wet.
If you skip these steps, your track may sound quiet, muddy, or distorted compared to commercial releases. Professional-grade mixing and mastering are what separate a rough demo from a hit song.