What Ultimate feature switches between two selected stages during a match?

What Ultimate feature switches between two selected stages during a match? Stage Morph.

Stage Morph lets players choose two different stages before a battle. During the match, the game transitions between them at set intervals, changing the battlefield while the fight continues. The feature can be used with many stage combinations and is separate from selecting a single stage's Battlefield or Omega form.

Stage Morph was introduced in Super Smash Bros. Ultimate as one of the game's notable stage innovations. It gives matches a shifting visual and tactical setting, although the transition itself is not a new round or a reset of damage, stocks, or the timer.

A common mix-up is confusing Stage Morph with stage transformations. A transforming stage changes its own layout or hazards, while Stage Morph switches between two separately selected stages. Spirit Board is an adventure mode, Squad Strike uses teams of fighters, and Smashdown restricts repeated character choices.