Reveal Hidden Folder Sizes in macOS Finder With These Tricks

When using macOS Finder in List view, you'll see the sizes of individual files – but not folders.
Instead, folders show a pair of dashes (--) in the Size column. macOS skips calculating folder sizes by default to keep List view performance fast, especially in directories with many nested files. But if you want to keep an eye on folder sizes in certain locations, or even globally, there are a few ways to do it. Here's how.
What if you want to use List view and still keep an eye on the size