The keypad on the OnePlus smartphone has a feature where double-tapping the spacebar on the keyboard inserts an automatic period and an additional space.

This function significantly increases typing speed, because after each sentence, you only need to tap the space twice to start another sentence.

Note: It is recommended to also enable auto-capitalize.

Android 10 | OxygenOS 10.0
Auto punctuate -  Open the  Settings
Auto punctuate -  Tap on  System
Auto punctuate -  Tap on  Languages & input
Auto punctuate -  Tap on  Virtual keyboard
Auto punctuate -  Tap on  Gboard
Auto punctuate -  Tap on  Text correction
Auto punctuate -  Enable or disable  Double-space period
  1. Open the Settings
  2. Tap on System
  3. Tap on Languages & input
  4. Tap on Virtual keyboard
  5. Tap on Gboard
  6. Tap on Text correction
  7. Enable or disable Double-space period

OnePlus Instructions