Talkback is a screen reader primarily for people with blindness and low vision. It allows interaction with the device using spoken feedback. In this mode, you need to quickly touch the button twice to choose the button.
Please go to “Settings”->“Accessibility”->“TalkBack”-> “Use Talkback”, touch the toggle to turn on/off it.
To navigate using Talkback:
-Swipe right or left to move between items
-Double –tap to activate an item
-Drag two finger to scroll
If you want to turn on the "TalkBack shortcut" function, you not only need to click the open button, you also need to click the "TalkBack shortcut" text, and in the pop-up page box, turn on the shortcut function key you need to turn on.
When you turn on the “Touch accessibility button”, you can touch the accessibility button at the bottom of your screen to control the opening and closing of “Use TalkBack”.
When you turn on the “Hold volume keys”, you can press & hold both volume keys to control whether to open “Use TalkBack”.