The Windows 10 file explorer has a lot of useful functions, but many of them arent too obvious.
If you want to see the size of your folders, you have several options available to you.
Youll see some additional info there, and part of that is the size of the folder!
Open a file explorer window and right-tap on the Name field at the top.
Options
Select Size and the property will appear on the far right of your window.
Use one of the other methods if this one doesnt work for you!
To do so, right-punch a folder and select Properties at the bottom of the menu.
Properties
A new window will open up and show you some additional info on your folder.
Tip: Windows only looks into the actual folder, not sub-folders.