If this function is activated on the Xiaomi smartphone, we access to hinted symbols after a long keystroke. Which symbol is hidden behind which key is shown to us on the virtual keyboard. We can also edit the duration of the keystroke until the symbol is inserted. By default, 300ms is set.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Additional settings
Step 3:  Tap on  Languages & input
Step 4:  Tap on  Manage keyboards
Step 5:  Open the  Settings
Step 6:  Tap on  Preferences
Step 7:  Enable or disable  Long press for symbols
  1. Open the Settings
  2. Tap on Additional settings
  3. Tap on Languages & input
  4. Tap on Manage keyboards
  5. Open the Settings
  6. Tap on Preferences
  7. Enable or disable Long press for symbols

Xiaomi Instructions