Every edit page has an MLS disclosure control, and it is set to Off by default. Turn it On before you apply and the result is saved with a Digitally Altered label and a disclosure stamp burned into the image itself, so it travels with the file through every download and share. Left off, nothing is labeled.
Because the default is off, the decision is yours on every edit. Disclosure rules vary by market and by board, so check what your MLS requires and turn it on for the edits that need it. Virtual staging is the usual case.
Virtual staging only ever adds furniture and decor. Walls, floors, windows, ceilings, and every architectural detail come through identical to the source photo, and so does the camera position, so the room you are showing stays the room that exists.
Custom Edit is the exception worth flagging. It is the one place you can change the property itself rather than just dress it, which is the point of it. Treat those edits as disclosure candidates by default.