There are a few ways to change column widths in Excel. One way is to click on the column header of the column you want to resize and then drag the header to the desired width. Another way is to double-click on the column header of the column you want to resize and then enter the desired width in the "Column Width" box that appears. You can also change column widths by selecting multiple columns and then choosing "Column Width" from the "Format" menu. Finally, you can change column widths by right-clicking on a column header and choosing "Column Width" from the context menu that appears.
When changing column widths, it is important to keep in mind that the width is measured in characters. Therefore, if you want to increase a column's width so that it can display more data, you will need to increase the number of characters that can fit in that column. For example, if you want a column to be able to display 50 characters, you would need to set the column width to 50.