The quick option to get there is simply to click in the address bar (the bit that says 'This PC -> Local Disk (C:) -> Users) and type in C:\Users\All Users, then hit enter.

To stop Explorer from hiding the folder from showing up, so you don't need to type in the path to get to it, you need to disable the option to hide protected OS files. From your Explorer window, go to View -> Options -> Change Folder and Search Options, then in the window that opens, choose the 'View' tab, and under Advanced Settings uncheck the 'Hide protected operating system files' checkbox.

Incidentally, C:\Users\All Users is a symbolic link to C:\ProgramData (although that's probably hidden by the same option). So when you go there (either by entering the path manually, or by clicking on it when unhidden) you'll actually end up in C:\ProgramData.