iCloud

Show or hide the sidebar in Mail on iCloud.com

The sidebar in Mail on iCloud.com contains the folder list and the Show Action Menu button . You can show and hide the sidebar.

In Mail on iCloud.com, do one of the following:

Show the sidebar: Click above the search field.
When the sidebar is visible, you can view your email folders and the Action pop-up menu .
Hide the sidebar: Click above the search field.
When the sidebar is hidden, you can navigate to your email folders by clicking the pop-up menu above the message list. To see the Action pop-up menu , click to show the sidebar.

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iCloud User Guide