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All you have to do is remove the kodi data folder to reset Kodi. Here are the locations

Operating                      systemFile path
Android                 Android/data/org.xbmc.kodi/files/.kodi/
iOS                       /private/var/mobile/Library/Preferences/Kodi//
Linux                   ~/.kodi/
Mac                      /Users/<your_user_name>/Library/Application Support/Kodi/
LibreELEC              /OpenELEC/storage/.kodi/
Windows               Start - type %APPDATA%\kodi\ - press <Enter>
Windows UWP       %LOCALAPPDATA%\Packages\XBMCFoundation.Kodi_4n2hpmxwrvr6p\LocalCache\Roaming\Kodi\