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As mentionned by @pnuts in the comments, you will find left/right arrows at the top right of Gmail (next to the Settings gear, as shown below). As a side note, you may also use keyboard shortcuts to go faster: press j to go to the next message press k to go to the previous message
I'm quite surprised this question has no good answers yet, so I'll do my best to create one. The "Why?" (don't read this if you only care about the solution) With some changes to YouTube, Google got a bad reputation for changing things against the users in order to make more money directly or indirectly. This also includes the "What to watch" feature, ...
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