Hi Bamini,

To change the size of a worksheet in Microsoft Excel, you can adjust the number of rows and columns that are displayed. Here are the steps to set the size of a worksheet to 20 rows and 10 columns:

1. Open the worksheet that you want to resize.
2. Click on the "View" tab in the ribbon at the top of the screen.
3. Click on the "Page Layout" button in the "Workbook Views" section.
4. Click on the "Size" button in the "Page Setup" section.
5. In the "Page Setup" dialog box, click on the "Sheet" tab.
6. In the "Print" section, set the "Rows to repeat at top" and "Columns to repeat at left" fields to the rows and columns that you want to display. In this case, you would set the "Rows to repeat at top" field to
   Code:

   1:20

   and the "Columns to repeat at left" field to
   Code:

   A:J

   .
7. Click "OK" to save your changes.

Now, every time you open the worksheet, only the first 20 rows and 10 columns will be displayed.

To set different sizes for different worksheets within the same workbook, simply repeat these steps for each worksheet that you want to resize.