To change the default print settings in Excel 2007, follow these steps:

1. Open Excel 2007 and click on the Office button in the top left corner of the screen.
2. Click on "Excel Options" at the bottom of the menu.
3. In the Excel Options dialog box, click on "Advanced" in the left-hand pane.
4. Scroll down to the "Print" section and click on the "Print options" button.
5. In the Print options dialog box, uncheck the "Collate" box and any other options you want to change.
6. Click on "OK" to save the changes and close the dialog box.
7. Click on "OK" again to close the Excel Options dialog box.

Now, whenever you print a worksheet in Excel 2007, it should use the default print settings you just configured. If you want to change the print settings for a specific worksheet, you can still do that by clicking on "Print" and then "Properties" before printing. However, the default settings should now be what you want them to be.