To adjust the width of a column, place your cursor on its right side (to the right of the column letter) and drag to your desired dimension.
To adjust the height of a row, play your cursor on the bottom line of the row (under the row number).
To adjust the width of every column in a dataset, select the entire dataset range and adjust any column. This will update all columns in the range.
To adjust the height of every row in a dataset, select the entire dataset range and adjust any row. This will update all rows in the range.
Want to adjust the layout of text in cells to view the cell's entire contents? Use Text Wrapping!
Select the range you would like to adjust. Visit the HOME tab on the menu ribbon and locate the ALIGNMENT section. Select the Text Wrapping button.
Remember, this will not adjust the size of your cells, so feel free to do so before or after.