Explanation there is the rest in comments
The inch tiles are larger, meaning they use less space.
I am pretty sure it is graphic keys because Control keys are the very top that allows you to do some things that you can't with the mouse, letter keys are the letter part, and the number keys is the number part
Hope this helps
Path. In *nix the dirname command can be used to isolate it.
Add your headings in the row of cells at the top of the sheet