Use this to smooth existing tracks. This command will attempt to remove corners and vias from a track path whilst retaining the connectivity and not introducing any design rule errors. The smoothing process will only introduce orthogonal segments.
Shortcuts
Toolbar: 
Default Keys: None
Default Menu: Tools
Command: Smooth All Tracks
Toolbar: 
Default Keys: None
Default Menu: Tools
Command: Smooth Selected Tracks
Locating this option
Available from: Tools menu > Smooth All Tracks or Selected Tracks options