Select the cell or range you want to expand
Move your cursor to the border of the column or row header
Drag the border outward to increase the cell size
Double-click the border to auto-fit the content
Use the Home tab
Click Format in the Cells group
Choose Column Width or Row Height
Enter the desired size and click OK
Turn on Wrap Text to make text fit within the cell
Merge adjacent cells if you need a larger combined cell
Use Increase Indent if you only want more visible space inside the cell