01
Name the starting state and the moving edge
Place the sheet flat with its long edges running left to right. Label the left short edge A and the right short edge B in the drawing. The revised action is bring edge A across to meet edge B. This wording identifies the part that moves and the part it meets. It also avoids using top without a defined viewpoint. The setup and its reference drawing belong before the action, because a reader holding the sheet vertically could otherwise follow the same words and produce a different fold from the one intended.
02
Add a check before making the crease
The next sentence asks the reader to align the two short edges and check that the upper and lower corners meet before pressing the fold. This places the check at a moment when the sheet can still be adjusted. Only then does the instruction say to press along the fold. The resulting folded rectangle has half the original left-to-right width, while its other dimension remains unchanged. A diagram can show the matched edges and the fold line separately, so the reader does not confuse the target edge with the crease.
03
Keep the revision focused on observable details
Compare the original fold it over with the revised sequence: orient the sheet, bring A to B, align the corners, then crease. Each added phrase resolves a particular ambiguity. A review card can ask which object moves, where it goes and how the reader checks it. Those questions are useful for this instruction, but they do not prove that every reader will find it clear. The next editorial step would be to observe actual use and revise any wording that still causes uncertainty, without inventing results before that happens.