As an analyst, a lot of the data I receive is not mine to analyze. They come from different sources. Sometime, because the width of the cells is too small, the data is not viewable. Below is an example of the data set with some hidden values because the cell width is too small.
Instead of resizing the columns individually, you can click on the yellow top left corner of the Excel document to select the entire worksheet. Then, hover your mouse between any two columns until you see a “T”. Once you do, double click. That would automatically expand the entire workbook in one single click.