To resize and move objects on a OneNote page on a Mac:

1. Open the Selection Pane by going to the View tab at the top, then selecting the Show Selection Pane option.
2. Make sure the object to resize and move is selected.
3. Using the Selection Pane, hold down the left-click mouse button and move the object to the desired location.
4. Using the Selection Pane, click the Size & Position icon to resize.
5. Enter the desired values, or drag one of the handles in the Size & Position window to the desired size to finish resizing.
6. Confirm the object is placed and sized properly.