The folders located at User/My Name/AppData/Roaming/Adobe/Adobe Photoshop 2020/Presets are all empty. I have tons of brushes. Many actions...etc. But all folders are empty. I have checked out the other versions 2018 and 2019 but they too are empty. So where are they hidden?
Those folders are created by Adobe so you can save the presets you create for photoshop versions 2020 . I leave these empty. I save my presets in folders I create and use my folders in all the versions of Photoshop I install.