The control bar (navigation bar) is used on the LG device by default using the buttons, but in addition to the button navigation, it can also be operated using gestures, although the gestures vary or are available depending on the model.

For example, to display the last opened app, you only have to wipe from the control bar upwards.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  Display
Step 3:  Tap on  Home touch buttons
Step 4:  Choose between  Buttons only  and  Gesture and buttons
  1. Open the Settings
  2. Tap on Display
  3. Tap on Home touch buttons
  4. Choose between Buttons only and Gesture and buttons

LG Instructions
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