Users don't seem to love the new Google Photos editing UI that has just started rolling out, complaining of missing features and too much change.

The perspective correction tool in Google Photos was used for straightening out flat, square objects in photos; think a document on a table or a painting hanging on a wall. You could manually define the four corners of whichever object in the original image, then Photos would distort the entire photo to square up the area you defined.

The Google Photos editing suite is often evolving, but for many users, the perspective correction tool has recently vanished.