1. Select the deformed rectangular object.

2. in the top menu bar, select edit > undo transform or press ctrl+z.

3. if the rectangular object has been saved, you can try to open the history panel (select "window" in the top menu bar >; History), and then select the most recent history to restore the original shape.

4. If none of the above methods can restore the original shape, you can try to adjust the size and shape of the rectangle manually, or redraw a new rectangle. Cdr, the abbreviation of CorelDRAW software, is a powerful graphic design software, which is used to create various designs, including logos, posters, business cards, packaging design and so on.