In Seishun Roblox, the couch is usually rotated the same way as other placeable furniture: grab it in placement mode, then use the rotate key/button before confirming the placement.

Try this

  • Pick up the couch so it is not placed yet.
  • Press the rotate control shown in-game, or on PC try R if the game uses the common Roblox furniture rotate binding.
  • If R does nothing, check whether the game uses a different key or whether R is already bound to another action.
  • On mobile or controller, rotate by using the on-screen rotate prompt or the rotate button near the placement controls.

If it still will not rotate

  • Some furniture pieces are not rotatable at all, so the couch may only work if that specific item is marked as rotatable.
  • A quick clue is whether the game shows a “press rotate” style prompt while you are holding the couch.
  • If there is no rotate prompt, the couch may be fixed in one direction.

Quick tip

A recent tutorial for Seishun-style furniture placement says to stand near the object, then use the rotate control while moving the stick/joystick or equivalent movement input.

TL;DR: enter furniture placement, select the couch, press the rotate key/prompt before placing it, and if nothing happens, that couch may not be rotatable.