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Sidestep is the dash/dodge (the control settings call it "Dodge Action" since its name and use differs by class).

• On controllers it should be RT (or R2, or the equivalent name for the back right shoulder trigger button) by default.
• On the keyboard it is X by default.

also you can use a attack depending of the class after doing the sidestep, however force and summoners can't do that and Techter can only do the action when using the wand reactor

The dodge action is tied to the weapon, not class. A force/techer/summoner with a gunslash for example will not use mirage escape, but will instead do the 'hunter/braver/fighter/bouncer' sidestep.

This distinction matters because all class weapons exist.