Hey there! I'm sorry to hear that you're having trouble adjusting your page breaks in Page Break Preview. Let's see if we can figure out what's going on.

1. First, make sure that you're in Page Break Preview mode. You can check this by going to the View tab on the ribbon and selecting Page Break Preview. If you're already in Page Break Preview mode, great! If not, switch to it and see if that helps.
   
2. Next, try clicking and dragging the page break lines to adjust them. If you're having trouble clicking on the page break lines, try zooming in or out to make them easier to see and click on.
   
3. If you're still having trouble, it's possible that the "Enable Editing" button is turned off. This button is located in the yellow bar at the top of the worksheet and allows you to make changes to the worksheet. If it's turned off, you won't be able to adjust the page breaks. Simply click on the button to turn it on.
   
4. If none of these solutions work, it's possible that there's a glitch in Excel. Try closing and reopening Excel, or restarting your computer, to see if that helps.

I hope this helps you adjust your page breaks in Page Break Preview!