Command ls in Linus is very powerful and you can list files any way you want using proper parameters. In case we want to sort files in a folder by size descending, we run a following command:
$ ls -S
This command show all files in a folder and list them descending by file size, but there's a problem, which we will explain in an article below. It's good to write about commands and outputs, but the best way, from my point of view, is to show everything on a real example (I tried it on openSUSE Linux, but
ls is a command, which works in every Linux distro, so don't be afraid something will work different way on your system.