There's an easy fix. Instead of using the marketing email's Unsubscribe link, use Gmail's Unsubscribe functionality! Here's how.
Gmail Users: are you stuck in an Unsubscribe loop?
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Delete emails on swipe in Gmail app for iPhone
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Ever wanted to delete your messages in Gmail on your iPhone by swiping? Yep, me too! My default swipe settings were configured to archive my messages, not to delete unwanted messages. Here are quick how-to instructions for setting deletion as your default swipe action for unwanted messages in the Gmail application on your iPhone.
How to collapse or expand Google Gmail’s left navigation menu
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If you ever find that Google's Menu (the left navigation) is hidden and only appears when you hover over the menu, and this drives you crazy, then fortunately there's a one-click fix.
You can toggle Gmail's Main Menu by clicking the hamburger menu (three horizontal lines). Clicking this main menu will expand or collapse your navigation