Using Mint and the stock task manager as my source:
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Click on 'em to sort by them. You can click on them twice, to sort low to high or high to low. (Down or Up)
I don't think I've seen a GUI task manager that didn't allow you to sort this way? There might be some. I want to say one of the older task manger GUIs from the LXDE would let you sort that way but wouldn't remember the setting, so you had to sort it manually every time you opened the task manager (system monitor in Mint lingo).
Just like sorting columns in other GUIs, it's pretty intuitive seeming - once you know you can. It's how you do things like sort by date/time in Thunderbird. Same principle.