Sure, here is a detailed professional answer for your question:

To preview a small portion of data in an Excel spreadsheet, you can use the "Freeze Panes" feature to lock specific rows and columns in place while scrolling through the rest of the worksheet. This allows you to keep important headers or labels visible at all times. Here's how you can do it:

1. Open your Excel spreadsheet and select the row or column below or to the right of the data you want to keep in view.

2. Click on the "View" tab in the Excel ribbon at the top of the screen.

3. In the "Window" group, click on the "Freeze Panes" dropdown menu.

4. Select either "Freeze Panes" to freeze the selected row or column, "Freeze Top Row" to keep the top row visible, or "Freeze First Column" to keep the first column visible.

5. Once you've selected the option that fits your needs, Excel will freeze the chosen rows or columns, allowing you to preview a small portion of data while scrolling through the rest of the spreadsheet.

If you want to unfreeze the panes, simply go back to the "Freeze Panes" dropdown menu and select "Unfreeze Panes."

By using the "Freeze Panes" feature in Excel, you can easily preview and work with a small portion of data while having the rest of the spreadsheet readily accessible. This can be especially useful when dealing with large datasets or complex spreadsheets.

I hope this helps! Let me know if you have any other questions about working with Excel.