What button is this in Blynk? And How?

Need Help With My Project
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So I was watching a video demonstration of Blynk. Can someone tell me the name of the button on the bottom right “mode”. And how did he sync it with the other 4 “modes” so it shows which number mode the LEDs are in? Does it do that automatically?

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2 posts were merged into an existing topic: Any solution to this Blynk/Board problem

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