Don't worry, I can help you with that! It sounds like you accidentally grouped your spreadsheet, but there's an easy way to ungroup it. Here's what you can do:

1. First, select the grouped cells by clicking on one of the cells in the group. You should see a thick border around all of the cells in the group.
2. Next, go to the "Data" tab in the ribbon at the top of the screen.
3. Look for the "Outline" section of the ribbon, and click on the "Ungroup" button. It should be the first button in the section, and it looks like two arrows pointing away from each other.
4. If the "Ungroup" button is grayed out and you can't click on it, it means that your cells are not actually grouped. In that case, the problem might be something else.
5. Once you click on the "Ungroup" button, the thick border around your cells should disappear, and you should be able to sort and edit your spreadsheet normally.