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You should upgrade or use an alternative browser. When I swipe left in the native Mail app on my iPad Pro, it brings up a menu with a "More" option and then the "Trash" option. I have to very deliberately swipe all the way to the left to delete. In the Gmail and Outlook apps, it's very easy to delete: you simply swipe once. Is there a way to adjust this behavior so the iPad Mail app behaves like Gmail and Outlook?