Return to the Storage button under all the folders on the left
Make it easier to manage and monitor the storage capacity in Mail. Even better would be to return to a much larger capacity in free mail. Barring that, the button below the folders does make it easier to monitor storage capacity, smoothly, without having to check under the far right icon. This only shows capacity currently used, and not the percentage of remaining space available. It also seems to be less precise/accurate.
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