Outlook stores a bunch of your email settings (turn on cloud access, hide favorites, show Bcc, and more) in the Windows Registry. Here's how to find where your Outlook settings are so you can edit them.
How to Reset the Registry in Windows to Default Settings
To find your Outlook settings in the Windows Registry, open the Registry Editor and locate the Outlook folder.
Open the start menu and search for regedit.
At the top of the Registry Editor window is a location field. Type HKEY_CURRENT_USER/Software/Microsoft/Office/ and then press Enter.