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What is this icon in the upper left corner

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This blue icon recently appeared in the upper left corner, and it's there even when I watch video full screen. Clicking on it doesn't do anything. What is it and how do I get rid of it when I want to watch video?

This blue icon recently appeared in the upper left corner, and it's there even when I watch video full screen. Clicking on it doesn't do anything. What is it and how do I get rid of it when I want to watch video?

Solusi terpilih

Figured it out, it's the new presenter overlay feature in Mac OS Sonoma

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Solusi Terpilih

Figured it out, it's the new presenter overlay feature in Mac OS Sonoma