Ah ok, what you are looking to do is merge cells - that's how they have made some of the columns look wider. If you look at the cells under the 'Description' heading it looks like they have merged cells across 5 columns together (you can see from the grid at the bottom).
To merge cells, highlight the cells you want to merge and click on the drop down arrow next to the 'Merge & center' button. You can then choose how you want to merge the cells. You can do this with any block of cells, so it can be across multiple rows and columns.
The longer way to do it is to right click on the highlighted cells. A menu will pop up and you want to click 'Format cells'. Pick the tab at the top that says 'Alignment', and then under the Text Control subsection tick the box to 'Merge cells'.
Hope this helps!