Download all of data?
How can I see EVERYTHING STORED IN. MY CLOUD?
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You can't in just one place. The closest you can come is to log into iCloud.com and use the various apps there. You can do likewise using the respective apps on a computer or mobile device. Even then some things might not be visible, such as backups and for those you need to use other methods.
Click on this link to read how to 'Manage your iCloud storage' --> https://support.apple.com/HT204247 - including seeing how much storage you have and how to delete items stored in iCloud such as backups, photos, files, mail, messages and voice memos.
Delete files in iCloud Drive on iCloud.com - https://help.apple.com/icloud/#/mm3b7fcd0c10