To navigate between the top-level folders in your account, and the subfolders they contain, start by clicking on the Files icon.
Now click on the name of the top-level folder that you want to browse through. You can click on a subfolder name to traverse deeper into the folders hierarchy and use the left arrow icon to move back up.
A folder view includes both folders and files. Each of the folders listed in the view use a different icon to indicate ownership and share status:
Your personal folder available for access and downloading files
Personal folder you shared with others
Folders others have shared with you