Tools > Relax Dialog
Relax Dialog—Lets you change the apparent surface tension in a selection of texture vertices by moving vertices closer to, or away from, their neighbors.
Choosing this command opens the Relax Tool dialog, whose settings work identically to those of the Relax modifier. The dialog also has an Apply button, which applies the current parameters to the selection, and a Set As Default button, which makes the current settings the default for the current modifier during the current session only.
The Relax Dialog command is available only in the Vertex sub-object mode.
Note: This command, as well as a Relax command that lets you apply the default settings to the current selection without opening the dialog, are available as assignable keyboard shortcuts.