OnePlus OxygenOS12 - Interaction Settings; Touch & Hold Delay

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 Select to speak
When select to speak is enabled, you can click on certain items on
the screen and the system will read them aloud.
 Text to speech（TTS）settings
You can customize the text-to-speech output.
You can also choose the language (temporarily support Chinese
and English), speed and pitch according to your usage habits.
Magnification: quickly zoom in on the screen to display content
more clearly.
Other functions: Color correlation, high contrast text, remove
animations and color inversion.
Hearing
 Live Caption: Automatically caption media
 Caption preferences
Live Caption detects speech in media and automatically generates
captions.
 Sound Amplifier
Sound Amplifier supports quick enablement in the following two
ways:
1. To enable the sound enhancer, swipe up from the bottom of
the screen with 2 fingers;
2. Press and hold both volume buttons for 3 seconds to active the
sound enhancer.