Apple has added support for multiple side formats in tvOS 18.2.
The company only announced 21:9, but there were more changes. The current support list now looks like this:
• automatically
• 16:9
• 21:9
• 2.37:1
• 2.39:1
• 2.40:1
•DCI 4K
• 32:9
Although virtually all modern TVs are 16:9, there are different aspect ratio options that are important to users who connect their Apple TV to projectors. You can change the aspect ratio in the menu Audio and video on Apple TV.
tvOS 18.2 brings support for other aspect ratios for Apple TV
When Apple announced tvOS 18 at WWDC in June, the company announced some new features that won’t be available in…
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Source: Iphones RU

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