With a compatible USB-C iPhone and Plugable HDMI adapter, external display options appear under Display & Brightness in Settings. Plugable describes choosing the external screen and selecting Dolby Vision, HDR, or SDR where the particular phone and display support those formats. A missing option may reflect display capability.

Allow Display Mode Changes can switch modes to match the content being viewed. Plugable notes that these transitions may briefly interrupt the video signal or cause flickering. Distinguish that expected mode change from a persistent connection failure before replacing an adapter or cable.