In the Disney+ app, you can see if your favorites support 4K Ultra HD by viewing the DETAILS tab on the title of the movie, show, or series you're about to watch.
You'll need a 4K Ultra HD or HDR device, TV, or display and a high-speed Internet connection (25 Mbps or higher recommended) to view content in 4K Ultra HD or HDR.
It’s automatic: Disney+ will automatically detect the capabilities of your system and play the content in 4K Ultra HD or HDR. Consult with the device manufacturer for the capabilities of your specific device(s).
To enjoy the highest-quality Disney+ experience, all components, including HDMI cables, should support high-bandwidth digital content. External displays should support HDCP 2.2 for 4K Ultra HD and HDR content. We also recommend updating your device software to the latest available version.
Note: Older audio and video components can have an impact on quality or possibly prevent playback entirely.